Print name if parameter passed to function












4















I have written a little function that exits if the value of the function argument is empty, I would like to be able to also print the name of the parameter (not the value!) if it is possible, my following implementation fails to print the name of the parameter.



function exitIfEmpty()
{
if [ -z "$1" ]
then
echo "Exiting because ${!1} is empty"
exit 1
fi
}


when called like so



exitIfEmpty someKey



should print



Exiting because someKey is empty









share|improve this question









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  • Wait, when you give it "someKey", $1 won't be empty. If it's empty, there's nothing to print.

    – choroba
    16 hours ago











  • @choroba I want to print the parameter name if possible not its value.

    – Xerxes
    16 hours ago






  • 1





    What do you mean by the name? Function arguments don't have names.

    – choroba
    16 hours ago
















4















I have written a little function that exits if the value of the function argument is empty, I would like to be able to also print the name of the parameter (not the value!) if it is possible, my following implementation fails to print the name of the parameter.



function exitIfEmpty()
{
if [ -z "$1" ]
then
echo "Exiting because ${!1} is empty"
exit 1
fi
}


when called like so



exitIfEmpty someKey



should print



Exiting because someKey is empty









share|improve this question









New contributor




Xerxes is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





















  • Wait, when you give it "someKey", $1 won't be empty. If it's empty, there's nothing to print.

    – choroba
    16 hours ago











  • @choroba I want to print the parameter name if possible not its value.

    – Xerxes
    16 hours ago






  • 1





    What do you mean by the name? Function arguments don't have names.

    – choroba
    16 hours ago














4












4








4


1






I have written a little function that exits if the value of the function argument is empty, I would like to be able to also print the name of the parameter (not the value!) if it is possible, my following implementation fails to print the name of the parameter.



function exitIfEmpty()
{
if [ -z "$1" ]
then
echo "Exiting because ${!1} is empty"
exit 1
fi
}


when called like so



exitIfEmpty someKey



should print



Exiting because someKey is empty









share|improve this question









New contributor




Xerxes is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












I have written a little function that exits if the value of the function argument is empty, I would like to be able to also print the name of the parameter (not the value!) if it is possible, my following implementation fails to print the name of the parameter.



function exitIfEmpty()
{
if [ -z "$1" ]
then
echo "Exiting because ${!1} is empty"
exit 1
fi
}


when called like so



exitIfEmpty someKey



should print



Exiting because someKey is empty






bash






share|improve this question









New contributor




Xerxes is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









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Xerxes is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question








edited 14 hours ago









GAD3R

27.5k1858114




27.5k1858114






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asked 16 hours ago









XerxesXerxes

1936




1936




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New contributor





Xerxes is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






Xerxes is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.













  • Wait, when you give it "someKey", $1 won't be empty. If it's empty, there's nothing to print.

    – choroba
    16 hours ago











  • @choroba I want to print the parameter name if possible not its value.

    – Xerxes
    16 hours ago






  • 1





    What do you mean by the name? Function arguments don't have names.

    – choroba
    16 hours ago



















  • Wait, when you give it "someKey", $1 won't be empty. If it's empty, there's nothing to print.

    – choroba
    16 hours ago











  • @choroba I want to print the parameter name if possible not its value.

    – Xerxes
    16 hours ago






  • 1





    What do you mean by the name? Function arguments don't have names.

    – choroba
    16 hours ago

















Wait, when you give it "someKey", $1 won't be empty. If it's empty, there's nothing to print.

– choroba
16 hours ago





Wait, when you give it "someKey", $1 won't be empty. If it's empty, there's nothing to print.

– choroba
16 hours ago













@choroba I want to print the parameter name if possible not its value.

– Xerxes
16 hours ago





@choroba I want to print the parameter name if possible not its value.

– Xerxes
16 hours ago




1




1





What do you mean by the name? Function arguments don't have names.

– choroba
16 hours ago





What do you mean by the name? Function arguments don't have names.

– choroba
16 hours ago










3 Answers
3






active

oldest

votes


















12














What gets passed to the function is just a string. If you run func somevar, what is passed is the string somevar. If you run func $somevar, what is passed is (the word-split) value of the variable somevar. Neither is a variable reference, a pointer or anything like that, they're just strings.



If you want to pass the name of a variable to a function, and then look at the value of that variable, you'll need to use a nameref (Bash 4.3 or later, IIRC), or an indirect reference ${!var}. ${!var} expands to the value of the variable named by `var.



So, you just have it the wrong way in the script, if you pass the name of a variable to function, use "${!1}" to get the value of the variable named in $1, and plain "$1" to get the name.



E.g. this will print variable bar is empty, exiting, and exit the shell:



#!/bin/bash
exitIfEmpty() {
if [ -z "${!1}" ]; then
echo "variable $1 is empty, exiting"
exit 1
fi
}
foo=x
unset bar
exitIfEmpty foo
exitIfEmpty bar





share|improve this answer































    2














    echo "Exiting because $1 is empty"


    should do the trick.






    share|improve this answer



















    • 2





      Wouldn't this always print Exiting because is empty, if the test is against $1 also? That doesn't seem very useful.

      – ilkkachu
      16 hours ago











    • ITYM echo 'Exit because $1 is empty' or echo "Exit because $1 is empty" -- single-quote strings don't do variable expansion; double-quoted strings require $ to be escaped

      – jimbobmcgee
      12 hours ago



















    1














    Pass the name as second argument



    function exitIfEmpty()
    {
    if [ -z "$1" ]
    then
    echo "Exiting because ${2} is empty"
    exit 1
    fi
    }

    exitIfEmpty $someKey someKey





    share|improve this answer








    New contributor




    JShorthouse is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.





















    • Here in the question, OP needs to check the value of first argument if it's set else exit; also OP may have not only passing single argument to the function.

      – αғsнιη
      13 hours ago











    • This doesn't work. If $someKey is empty then the call will be exitIfEmpty someKey and $2 will be unset. Always quote variables: exitIfEmpty "$someKey" someKey.

      – John Kugelman
      9 hours ago











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    3 Answers
    3






    active

    oldest

    votes








    3 Answers
    3






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    12














    What gets passed to the function is just a string. If you run func somevar, what is passed is the string somevar. If you run func $somevar, what is passed is (the word-split) value of the variable somevar. Neither is a variable reference, a pointer or anything like that, they're just strings.



    If you want to pass the name of a variable to a function, and then look at the value of that variable, you'll need to use a nameref (Bash 4.3 or later, IIRC), or an indirect reference ${!var}. ${!var} expands to the value of the variable named by `var.



    So, you just have it the wrong way in the script, if you pass the name of a variable to function, use "${!1}" to get the value of the variable named in $1, and plain "$1" to get the name.



    E.g. this will print variable bar is empty, exiting, and exit the shell:



    #!/bin/bash
    exitIfEmpty() {
    if [ -z "${!1}" ]; then
    echo "variable $1 is empty, exiting"
    exit 1
    fi
    }
    foo=x
    unset bar
    exitIfEmpty foo
    exitIfEmpty bar





    share|improve this answer




























      12














      What gets passed to the function is just a string. If you run func somevar, what is passed is the string somevar. If you run func $somevar, what is passed is (the word-split) value of the variable somevar. Neither is a variable reference, a pointer or anything like that, they're just strings.



      If you want to pass the name of a variable to a function, and then look at the value of that variable, you'll need to use a nameref (Bash 4.3 or later, IIRC), or an indirect reference ${!var}. ${!var} expands to the value of the variable named by `var.



      So, you just have it the wrong way in the script, if you pass the name of a variable to function, use "${!1}" to get the value of the variable named in $1, and plain "$1" to get the name.



      E.g. this will print variable bar is empty, exiting, and exit the shell:



      #!/bin/bash
      exitIfEmpty() {
      if [ -z "${!1}" ]; then
      echo "variable $1 is empty, exiting"
      exit 1
      fi
      }
      foo=x
      unset bar
      exitIfEmpty foo
      exitIfEmpty bar





      share|improve this answer


























        12












        12








        12







        What gets passed to the function is just a string. If you run func somevar, what is passed is the string somevar. If you run func $somevar, what is passed is (the word-split) value of the variable somevar. Neither is a variable reference, a pointer or anything like that, they're just strings.



        If you want to pass the name of a variable to a function, and then look at the value of that variable, you'll need to use a nameref (Bash 4.3 or later, IIRC), or an indirect reference ${!var}. ${!var} expands to the value of the variable named by `var.



        So, you just have it the wrong way in the script, if you pass the name of a variable to function, use "${!1}" to get the value of the variable named in $1, and plain "$1" to get the name.



        E.g. this will print variable bar is empty, exiting, and exit the shell:



        #!/bin/bash
        exitIfEmpty() {
        if [ -z "${!1}" ]; then
        echo "variable $1 is empty, exiting"
        exit 1
        fi
        }
        foo=x
        unset bar
        exitIfEmpty foo
        exitIfEmpty bar





        share|improve this answer













        What gets passed to the function is just a string. If you run func somevar, what is passed is the string somevar. If you run func $somevar, what is passed is (the word-split) value of the variable somevar. Neither is a variable reference, a pointer or anything like that, they're just strings.



        If you want to pass the name of a variable to a function, and then look at the value of that variable, you'll need to use a nameref (Bash 4.3 or later, IIRC), or an indirect reference ${!var}. ${!var} expands to the value of the variable named by `var.



        So, you just have it the wrong way in the script, if you pass the name of a variable to function, use "${!1}" to get the value of the variable named in $1, and plain "$1" to get the name.



        E.g. this will print variable bar is empty, exiting, and exit the shell:



        #!/bin/bash
        exitIfEmpty() {
        if [ -z "${!1}" ]; then
        echo "variable $1 is empty, exiting"
        exit 1
        fi
        }
        foo=x
        unset bar
        exitIfEmpty foo
        exitIfEmpty bar






        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 16 hours ago









        ilkkachuilkkachu

        62.7k10103180




        62.7k10103180

























            2














            echo "Exiting because $1 is empty"


            should do the trick.






            share|improve this answer



















            • 2





              Wouldn't this always print Exiting because is empty, if the test is against $1 also? That doesn't seem very useful.

              – ilkkachu
              16 hours ago











            • ITYM echo 'Exit because $1 is empty' or echo "Exit because $1 is empty" -- single-quote strings don't do variable expansion; double-quoted strings require $ to be escaped

              – jimbobmcgee
              12 hours ago
















            2














            echo "Exiting because $1 is empty"


            should do the trick.






            share|improve this answer



















            • 2





              Wouldn't this always print Exiting because is empty, if the test is against $1 also? That doesn't seem very useful.

              – ilkkachu
              16 hours ago











            • ITYM echo 'Exit because $1 is empty' or echo "Exit because $1 is empty" -- single-quote strings don't do variable expansion; double-quoted strings require $ to be escaped

              – jimbobmcgee
              12 hours ago














            2












            2








            2







            echo "Exiting because $1 is empty"


            should do the trick.






            share|improve this answer













            echo "Exiting because $1 is empty"


            should do the trick.







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered 16 hours ago









            PankiPanki

            838412




            838412








            • 2





              Wouldn't this always print Exiting because is empty, if the test is against $1 also? That doesn't seem very useful.

              – ilkkachu
              16 hours ago











            • ITYM echo 'Exit because $1 is empty' or echo "Exit because $1 is empty" -- single-quote strings don't do variable expansion; double-quoted strings require $ to be escaped

              – jimbobmcgee
              12 hours ago














            • 2





              Wouldn't this always print Exiting because is empty, if the test is against $1 also? That doesn't seem very useful.

              – ilkkachu
              16 hours ago











            • ITYM echo 'Exit because $1 is empty' or echo "Exit because $1 is empty" -- single-quote strings don't do variable expansion; double-quoted strings require $ to be escaped

              – jimbobmcgee
              12 hours ago








            2




            2





            Wouldn't this always print Exiting because is empty, if the test is against $1 also? That doesn't seem very useful.

            – ilkkachu
            16 hours ago





            Wouldn't this always print Exiting because is empty, if the test is against $1 also? That doesn't seem very useful.

            – ilkkachu
            16 hours ago













            ITYM echo 'Exit because $1 is empty' or echo "Exit because $1 is empty" -- single-quote strings don't do variable expansion; double-quoted strings require $ to be escaped

            – jimbobmcgee
            12 hours ago





            ITYM echo 'Exit because $1 is empty' or echo "Exit because $1 is empty" -- single-quote strings don't do variable expansion; double-quoted strings require $ to be escaped

            – jimbobmcgee
            12 hours ago











            1














            Pass the name as second argument



            function exitIfEmpty()
            {
            if [ -z "$1" ]
            then
            echo "Exiting because ${2} is empty"
            exit 1
            fi
            }

            exitIfEmpty $someKey someKey





            share|improve this answer








            New contributor




            JShorthouse is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
            Check out our Code of Conduct.





















            • Here in the question, OP needs to check the value of first argument if it's set else exit; also OP may have not only passing single argument to the function.

              – αғsнιη
              13 hours ago











            • This doesn't work. If $someKey is empty then the call will be exitIfEmpty someKey and $2 will be unset. Always quote variables: exitIfEmpty "$someKey" someKey.

              – John Kugelman
              9 hours ago
















            1














            Pass the name as second argument



            function exitIfEmpty()
            {
            if [ -z "$1" ]
            then
            echo "Exiting because ${2} is empty"
            exit 1
            fi
            }

            exitIfEmpty $someKey someKey





            share|improve this answer








            New contributor




            JShorthouse is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
            Check out our Code of Conduct.





















            • Here in the question, OP needs to check the value of first argument if it's set else exit; also OP may have not only passing single argument to the function.

              – αғsнιη
              13 hours ago











            • This doesn't work. If $someKey is empty then the call will be exitIfEmpty someKey and $2 will be unset. Always quote variables: exitIfEmpty "$someKey" someKey.

              – John Kugelman
              9 hours ago














            1












            1








            1







            Pass the name as second argument



            function exitIfEmpty()
            {
            if [ -z "$1" ]
            then
            echo "Exiting because ${2} is empty"
            exit 1
            fi
            }

            exitIfEmpty $someKey someKey





            share|improve this answer








            New contributor




            JShorthouse is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
            Check out our Code of Conduct.










            Pass the name as second argument



            function exitIfEmpty()
            {
            if [ -z "$1" ]
            then
            echo "Exiting because ${2} is empty"
            exit 1
            fi
            }

            exitIfEmpty $someKey someKey






            share|improve this answer








            New contributor




            JShorthouse is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
            Check out our Code of Conduct.









            share|improve this answer



            share|improve this answer






            New contributor




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            answered 16 hours ago









            JShorthouseJShorthouse

            37316




            37316




            New contributor




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            New contributor





            JShorthouse is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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            JShorthouse is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
            Check out our Code of Conduct.













            • Here in the question, OP needs to check the value of first argument if it's set else exit; also OP may have not only passing single argument to the function.

              – αғsнιη
              13 hours ago











            • This doesn't work. If $someKey is empty then the call will be exitIfEmpty someKey and $2 will be unset. Always quote variables: exitIfEmpty "$someKey" someKey.

              – John Kugelman
              9 hours ago



















            • Here in the question, OP needs to check the value of first argument if it's set else exit; also OP may have not only passing single argument to the function.

              – αғsнιη
              13 hours ago











            • This doesn't work. If $someKey is empty then the call will be exitIfEmpty someKey and $2 will be unset. Always quote variables: exitIfEmpty "$someKey" someKey.

              – John Kugelman
              9 hours ago

















            Here in the question, OP needs to check the value of first argument if it's set else exit; also OP may have not only passing single argument to the function.

            – αғsнιη
            13 hours ago





            Here in the question, OP needs to check the value of first argument if it's set else exit; also OP may have not only passing single argument to the function.

            – αғsнιη
            13 hours ago













            This doesn't work. If $someKey is empty then the call will be exitIfEmpty someKey and $2 will be unset. Always quote variables: exitIfEmpty "$someKey" someKey.

            – John Kugelman
            9 hours ago





            This doesn't work. If $someKey is empty then the call will be exitIfEmpty someKey and $2 will be unset. Always quote variables: exitIfEmpty "$someKey" someKey.

            – John Kugelman
            9 hours ago










            Xerxes is a new contributor. Be nice, and check out our Code of Conduct.










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Hall Of Fame””Slayer Wins 'Best Metal' Grammy Award””Slayer Guitarist Jeff Hanneman Dies””Bullet-For My Valentine booed at Metal Hammer Golden Gods Awards””Unholy Aliance””The End Of Slayer?””Slayer: We Could Thrash Out Two More Albums If We're Fast Enough...””'The Unholy Alliance: Chapter III' UK Dates Added”originalet”Megadeth And Slayer To Co-Headline 'Canadian Carnage' Trek”originalet”World Painted Blood””Release “World Painted Blood” by Slayer””Metallica Heading To Cinemas””Slayer, Megadeth To Join Forces For 'European Carnage' Tour - Dec. 18, 2010”originalet”Slayer's Hanneman Contracts Acute Infection; Band To Bring In Guest Guitarist””Cannibal Corpse's Pat O'Brien Will Step In As Slayer's Guest Guitarist”originalet”Slayer’s Jeff Hanneman Dead at 49””Dave Lombardo Says He Made Only $67,000 In 2011 While Touring With Slayer””Slayer: We Do Not Agree With Dave Lombardo's Substance Or Timeline Of Events””Slayer Welcomes Drummer Paul Bostaph Back To The Fold””Slayer Hope to Unveil Never-Before-Heard Jeff Hanneman Material on Next Album””Slayer Debut New Song 'Implode' During Surprise Golden Gods Appearance””Release group Repentless by Slayer””Repentless - Slayer - Credits””Slayer””Metal Storm Awards 2015””Slayer - to release comic book "Repentless #1"””Slayer To Release 'Repentless' 6.66" Vinyl Box Set””BREAKING NEWS: Slayer Announce Farewell Tour””Slayer Recruit Lamb of God, Anthrax, Behemoth + Testament for Final Tour””Slayer lägger ner efter 37 år””Slayer Announces Second North American Leg Of 'Final' Tour””Final World Tour””Slayer Announces Final European Tour With Lamb of God, Anthrax And Obituary””Slayer To Tour Europe With Lamb of God, Anthrax And Obituary””Slayer To Play 'Last French Show Ever' At Next Year's Hellfst””Slayer's Final World Tour Will Extend Into 2019””Death Angel's Rob Cavestany On Slayer's 'Farewell' Tour: 'Some Of Us Could See This Coming'””Testament Has No Plans To Retire Anytime Soon, Says Chuck Billy””Anthrax's Scott Ian On Slayer's 'Farewell' Tour Plans: 'I Was Surprised And I Wasn't Surprised'””Slayer””Slayer's Morbid Schlock””Review/Rock; For Slayer, the Mania Is the Message””Slayer - Biography””Slayer - Reign In Blood”originalet”Dave Lombardo””An exclusive oral history of Slayer”originalet”Exclusive! Interview With Slayer Guitarist Jeff Hanneman”originalet”Thinking Out Loud: Slayer's Kerry King on hair metal, Satan and being polite””Slayer Lyrics””Slayer - Biography””Most influential artists for extreme metal music””Slayer - Reign in Blood””Slayer guitarist Jeff Hanneman dies aged 49””Slatanic Slaughter: A Tribute to Slayer””Gateway to Hell: A Tribute to Slayer””Covered In Blood””Slayer: The Origins of Thrash in San Francisco, CA.””Why They Rule - #6 Slayer”originalet”Guitar World's 100 Greatest Heavy Metal Guitarists Of All Time”originalet”The fans have spoken: Slayer comes out on top in readers' polls”originalet”Tribute to Jeff Hanneman (1964-2013)””Lamb Of God Frontman: We Sound Like A Slayer Rip-Off””BEHEMOTH Frontman Pays Tribute To SLAYER's JEFF HANNEMAN””Slayer, Hatebreed Doing Double Duty On This Year's Ozzfest””System of a Down””Lacuna Coil’s Andrea Ferro Talks Influences, Skateboarding, Band Origins + More””Slayer - Reign in Blood””Into The Lungs of Hell””Slayer rules - en utställning om fans””Slayer and Their Fans Slashed Through a No-Holds-Barred Night at Gas Monkey””Home””Slayer””Gold & Platinum - The Big 4 Live from Sofia, Bulgaria””Exclusive! Interview With Slayer Guitarist Kerry King””2008-02-23: Wiltern, Los Angeles, CA, USA””Slayer's Kerry King To Perform With Megadeth Tonight! - Oct. 21, 2010”originalet”Dave Lombardo - Biography”Slayer Case DismissedArkiveradUltimate Classic Rock: Slayer guitarist Jeff Hanneman dead at 49.”Slayer: "We could never do any thing like Some Kind Of Monster..."””Cannibal Corpse'S Pat O'Brien Will Step In As Slayer'S Guest Guitarist | The Official Slayer Site”originalet”Slayer Wins 'Best Metal' Grammy Award””Slayer Guitarist Jeff Hanneman Dies””Kerrang! Awards 2006 Blog: Kerrang! Hall Of Fame””Kerrang! Awards 2013: Kerrang! Legend”originalet”Metallica, Slayer, Iron Maien Among Winners At Metal Hammer Awards””Metal Hammer Golden Gods Awards””Bullet For My Valentine Booed At Metal Hammer Golden Gods Awards””Metal Storm Awards 2006””Metal Storm Awards 2015””Slayer's Concert History””Slayer - Relationships””Slayer - Releases”Slayers officiella webbplatsSlayer på MusicBrainzOfficiell webbplatsSlayerSlayerr1373445760000 0001 1540 47353068615-5086262726cb13906545x(data)6033143kn20030215029