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How to prepend a string to only the lines of text which are numbers
Automatically doubling the value of numbers in a string in multiple filesHow can I count lines of differently named files, and write the outcome to a csv file?Multiplying numbers in file by random numbersHow to get line from a file using line number and edit it easily?Only in lines with a specific string replace another stringDelete all lines from middle of a line matching a string until the second string match is foundInsert a line of text after the line containing the last occurence of a specified wordDelete ranges of lines, but skip the comments which come in between the linesHow to recursively go through all text files in a directory to fetch the desired line, and write these lines to same text file?grep and sed only the numbers from a text file's line
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
Suppose I have 6 lines of text.
Series
Of
Word
73914
Again
Word
I need to prepend a string to the beginning of lines that contain ONLY numbers. Say I insert number-
Series
Of
Word
number-73914
Again
Word
Currently I run two commands to achieve the desired result. I wonder if there is a more efficient method.
Note: There are 1000+ lines, so preferably this applies to all lines ( I already state it ).
command-line text-processing sed awk
edited Mar 29 at 9:21
Martin Thornton
2,56361830
asked Mar 29 at 3:24
JimJim
8,91122346
add a comment |
Suppose I have 6 lines of text.
Series
Of
Word
73914
Again
Word
I need to prepend a string to the beginning of lines that contain ONLY numbers. Say I insert number-
Series
Of
Word
number-73914
Again
Word
Currently I run two commands to achieve the desired result. I wonder if there is a more efficient method.
Note: There are 1000+ lines, so preferably this applies to all lines ( I already state it ).
command-line text-processing sed awk
edited Mar 29 at 9:21
Martin Thornton
2,56361830
asked Mar 29 at 3:24
JimJim
8,91122346
What do you want to do with a line like1st word 2nd word?
– glenn jackman
Mar 29 at 18:00
And do you want only lines that are entirely a number or that start with a number? E.g. would you want123abcto be changed tonumber-123abcor not?
– Kevin
Mar 29 at 19:57
add a comment |
Suppose I have 6 lines of text.
Series
Of
Word
73914
Again
Word
I need to prepend a string to the beginning of lines that contain ONLY numbers. Say I insert number-
Series
Of
Word
number-73914
Again
Word
Currently I run two commands to achieve the desired result. I wonder if there is a more efficient method.
Note: There are 1000+ lines, so preferably this applies to all lines ( I already state it ).
command-line text-processing sed awk
edited Mar 29 at 9:21
Martin Thornton
2,56361830
asked Mar 29 at 3:24
JimJim
8,91122346
Suppose I have 6 lines of text.
Series
Of
Word
73914
Again
Word
I need to prepend a string to the beginning of lines that contain ONLY numbers. Say I insert number-
Series
Of
Word
number-73914
Again
Word
Currently I run two commands to achieve the desired result. I wonder if there is a more efficient method.
Note: There are 1000+ lines, so preferably this applies to all lines ( I already state it ).
command-line text-processing sed awk
command-line text-processing sed awk
edited Mar 29 at 9:21
Martin Thornton
2,56361830
asked Mar 29 at 3:24
JimJim
8,91122346
edited Mar 29 at 9:21
Martin Thornton
2,56361830
asked Mar 29 at 3:24
JimJim
8,91122346
edited Mar 29 at 9:21
Martin Thornton
2,56361830
edited Mar 29 at 9:21
Martin Thornton
2,56361830
edited Mar 29 at 9:21
Martin Thornton
2,56361830
2,56361830
asked Mar 29 at 3:24
JimJim
8,91122346
asked Mar 29 at 3:24
JimJim
8,91122346
asked Mar 29 at 3:24
JimJim
8,91122346
8,91122346
What do you want to do with a line like1st word 2nd word?
– glenn jackman
Mar 29 at 18:00
And do you want only lines that are entirely a number or that start with a number? E.g. would you want123abcto be changed tonumber-123abcor not?
– Kevin
Mar 29 at 19:57
add a comment |
What do you want to do with a line like1st word 2nd word?
– glenn jackman
Mar 29 at 18:00
And do you want only lines that are entirely a number or that start with a number? E.g. would you want123abcto be changed tonumber-123abcor not?
– Kevin
Mar 29 at 19:57
What do you want to do with a line like
1st word 2nd word?– glenn jackman
Mar 29 at 18:00
What do you want to do with a line like
1st word 2nd word?– glenn jackman
Mar 29 at 18:00
And do you want only lines that are entirely a number or that start with a number? E.g. would you want
123abc to be changed to number-123abc or not?– Kevin
Mar 29 at 19:57
And do you want only lines that are entirely a number or that start with a number? E.g. would you want
123abc to be changed to number-123abc or not?– Kevin
Mar 29 at 19:57
add a comment |
4 Answers
4
active
oldest
votes
sed can do that:
$ sed 's/^[[:digit:]]*$/number-&/' input.txt
Series
Of
Word
number-73914
Again
Word
In case we want to account for empty lines, we'd use + and -r option:
$ sed -r 's/^[[:digit:]]+$/number-&/' input.txt
Series
Of
Word
number-73914
Again
Word
line below is empty
line above is empty
Once you verify everything is proper, you can use -i option to edit the file itself, i.e. sed -i .... Otherwise, you can always make a copy of the file with sed 's/^[[:digit:]]*$/number-&/' input.txt > output.txt
Note that this assumes consistent file format, with no leading whitespaces or trailing whitespaces on each line.
And here's Python as extra:
$ python3 -c 'import sys; print("n".join([ "number-" + i.strip() if i.strip().isnumeric() else i.strip() for i in sys.stdin]))' < input.txt
Series
Of
Word
number-73914
Again
Word
line below is empty
line above is empty
answered Mar 29 at 7:00
Sergiy KolodyazhnyySergiy Kolodyazhnyy
75.9k9158333
2
I often use the "substitute if match" variant for things like this/^[[:digit:]]+$/ s/^/number-/'
– steeldriver
Mar 29 at 7:29
Thanks for the complete instruction, I'm a total noob when it comes to text processing :-O
– Jim
Mar 29 at 9:41
add a comment |
One way using awk:
awk '/^[0-9]+$/$0="number-"$0;1' file
answered Mar 29 at 7:04
GuruGuru
52838
I also seekawksolution, thanks ! 1+
– Jim
Mar 29 at 9:42
add a comment |
lines that contain ONLY numbers
It's unclear whether you mean numbers or just 0-9. Here's a Perl one-liner that picks out the likes of 123, 3.14 and 1e-12 while ignoring various representations of infinity and not-a-number:
$ perl -MScalar::Util -ne 'chomp; if (!(m/^s/ || m/^[+-]?inf(?:inity)?$/i || m/^nan$/i) && Scalar::Util::looks_like_number($_)) print("N:"); print("$_n");' <x
a
N:123
N:+1
N:-1
1
b
1a
N:3.14
c
3.1415926 is an approximation of pi
N:1e-12
inf
Inf
Infinity
Infinity +1 sword
+Infinity
-infinity
NaN
1/2
I changed the prefix to "N:" simply because "number--1" looks a bit rubbish. Note that this treats " 1", for example, as not numeric. If that is undesirable behaviour, do not include the "m/^s/" test for leading whitespace.
If you mean "0-9", Sergiy's sed solution above is fine.
answered Mar 29 at 11:56
Chris WilliamsChris Williams
311
Probably an overkill for this question, but still awesome ! +1
– Sergiy Kolodyazhnyy
Mar 29 at 12:06
add a comment |
You can try this
$cat input.txt
Series
Of
Word
73914
Again
Word
$awk ' if($1 ~/[0-9]/) printf "number - %sn",$1; else print $1 ' input.txt
Series
Of
Word
number - 73914
Again
Word
answered Mar 29 at 7:26
GoronGoron
1719
Usingifstatement, nice ! Thank you :D
– Jim
Mar 29 at 9:42
add a comment |
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4 Answers
4
active
oldest
votes
4 Answers
4
active
oldest
votes
active
oldest
votes
active
oldest
votes
sed can do that:
$ sed 's/^[[:digit:]]*$/number-&/' input.txt
Series
Of
Word
number-73914
Again
Word
In case we want to account for empty lines, we'd use + and -r option:
$ sed -r 's/^[[:digit:]]+$/number-&/' input.txt
Series
Of
Word
number-73914
Again
Word
line below is empty
line above is empty
Once you verify everything is proper, you can use -i option to edit the file itself, i.e. sed -i .... Otherwise, you can always make a copy of the file with sed 's/^[[:digit:]]*$/number-&/' input.txt > output.txt
Note that this assumes consistent file format, with no leading whitespaces or trailing whitespaces on each line.
And here's Python as extra:
$ python3 -c 'import sys; print("n".join([ "number-" + i.strip() if i.strip().isnumeric() else i.strip() for i in sys.stdin]))' < input.txt
Series
Of
Word
number-73914
Again
Word
line below is empty
line above is empty
answered Mar 29 at 7:00
Sergiy KolodyazhnyySergiy Kolodyazhnyy
75.9k9158333
2
I often use the "substitute if match" variant for things like this/^[[:digit:]]+$/ s/^/number-/'
– steeldriver
Mar 29 at 7:29
Thanks for the complete instruction, I'm a total noob when it comes to text processing :-O
– Jim
Mar 29 at 9:41
add a comment |
sed can do that:
$ sed 's/^[[:digit:]]*$/number-&/' input.txt
Series
Of
Word
number-73914
Again
Word
In case we want to account for empty lines, we'd use + and -r option:
$ sed -r 's/^[[:digit:]]+$/number-&/' input.txt
Series
Of
Word
number-73914
Again
Word
line below is empty
line above is empty
Once you verify everything is proper, you can use -i option to edit the file itself, i.e. sed -i .... Otherwise, you can always make a copy of the file with sed 's/^[[:digit:]]*$/number-&/' input.txt > output.txt
Note that this assumes consistent file format, with no leading whitespaces or trailing whitespaces on each line.
And here's Python as extra:
$ python3 -c 'import sys; print("n".join([ "number-" + i.strip() if i.strip().isnumeric() else i.strip() for i in sys.stdin]))' < input.txt
Series
Of
Word
number-73914
Again
Word
line below is empty
line above is empty
answered Mar 29 at 7:00
Sergiy KolodyazhnyySergiy Kolodyazhnyy
75.9k9158333
2
I often use the "substitute if match" variant for things like this/^[[:digit:]]+$/ s/^/number-/'
– steeldriver
Mar 29 at 7:29
Thanks for the complete instruction, I'm a total noob when it comes to text processing :-O
– Jim
Mar 29 at 9:41
add a comment |
sed can do that:
$ sed 's/^[[:digit:]]*$/number-&/' input.txt
Series
Of
Word
number-73914
Again
Word
In case we want to account for empty lines, we'd use + and -r option:
$ sed -r 's/^[[:digit:]]+$/number-&/' input.txt
Series
Of
Word
number-73914
Again
Word
line below is empty
line above is empty
Once you verify everything is proper, you can use -i option to edit the file itself, i.e. sed -i .... Otherwise, you can always make a copy of the file with sed 's/^[[:digit:]]*$/number-&/' input.txt > output.txt
Note that this assumes consistent file format, with no leading whitespaces or trailing whitespaces on each line.
And here's Python as extra:
$ python3 -c 'import sys; print("n".join([ "number-" + i.strip() if i.strip().isnumeric() else i.strip() for i in sys.stdin]))' < input.txt
Series
Of
Word
number-73914
Again
Word
line below is empty
line above is empty
answered Mar 29 at 7:00
Sergiy KolodyazhnyySergiy Kolodyazhnyy
75.9k9158333
sed can do that:
$ sed 's/^[[:digit:]]*$/number-&/' input.txt
Series
Of
Word
number-73914
Again
Word
In case we want to account for empty lines, we'd use + and -r option:
$ sed -r 's/^[[:digit:]]+$/number-&/' input.txt
Series
Of
Word
number-73914
Again
Word
line below is empty
line above is empty
Once you verify everything is proper, you can use -i option to edit the file itself, i.e. sed -i .... Otherwise, you can always make a copy of the file with sed 's/^[[:digit:]]*$/number-&/' input.txt > output.txt
Note that this assumes consistent file format, with no leading whitespaces or trailing whitespaces on each line.
And here's Python as extra:
$ python3 -c 'import sys; print("n".join([ "number-" + i.strip() if i.strip().isnumeric() else i.strip() for i in sys.stdin]))' < input.txt
Series
Of
Word
number-73914
Again
Word
line below is empty
line above is empty
answered Mar 29 at 7:00
Sergiy KolodyazhnyySergiy Kolodyazhnyy
75.9k9158333
edited Mar 29 at 7:07
answered Mar 29 at 7:00
Sergiy KolodyazhnyySergiy Kolodyazhnyy
75.9k9158333
answered Mar 29 at 7:00
Sergiy KolodyazhnyySergiy Kolodyazhnyy
75.9k9158333
answered Mar 29 at 7:00
Sergiy KolodyazhnyySergiy Kolodyazhnyy
75.9k9158333
75.9k9158333
2
I often use the "substitute if match" variant for things like this/^[[:digit:]]+$/ s/^/number-/'
– steeldriver
Mar 29 at 7:29
Thanks for the complete instruction, I'm a total noob when it comes to text processing :-O
– Jim
Mar 29 at 9:41
add a comment |
2
I often use the "substitute if match" variant for things like this/^[[:digit:]]+$/ s/^/number-/'
– steeldriver
Mar 29 at 7:29
Thanks for the complete instruction, I'm a total noob when it comes to text processing :-O
– Jim
Mar 29 at 9:41
2
2
I often use the "substitute if match" variant for things like this
/^[[:digit:]]+$/ s/^/number-/'– steeldriver
Mar 29 at 7:29
I often use the "substitute if match" variant for things like this
/^[[:digit:]]+$/ s/^/number-/'– steeldriver
Mar 29 at 7:29
Thanks for the complete instruction, I'm a total noob when it comes to text processing :-O
– Jim
Mar 29 at 9:41
Thanks for the complete instruction, I'm a total noob when it comes to text processing :-O
– Jim
Mar 29 at 9:41
add a comment |
One way using awk:
awk '/^[0-9]+$/$0="number-"$0;1' file
answered Mar 29 at 7:04
GuruGuru
52838
I also seekawksolution, thanks ! 1+
– Jim
Mar 29 at 9:42
add a comment |
One way using awk:
awk '/^[0-9]+$/$0="number-"$0;1' file
answered Mar 29 at 7:04
GuruGuru
52838
I also seekawksolution, thanks ! 1+
– Jim
Mar 29 at 9:42
add a comment |
One way using awk:
awk '/^[0-9]+$/$0="number-"$0;1' file
answered Mar 29 at 7:04
GuruGuru
52838
One way using awk:
awk '/^[0-9]+$/$0="number-"$0;1' file
answered Mar 29 at 7:04
GuruGuru
52838
answered Mar 29 at 7:04
GuruGuru
52838
answered Mar 29 at 7:04
GuruGuru
52838
answered Mar 29 at 7:04
GuruGuru
52838
52838
I also seekawksolution, thanks ! 1+
– Jim
Mar 29 at 9:42
add a comment |
I also seekawksolution, thanks ! 1+
– Jim
Mar 29 at 9:42
I also seek
awk solution, thanks ! 1+– Jim
Mar 29 at 9:42
I also seek
awk solution, thanks ! 1+– Jim
Mar 29 at 9:42
add a comment |
lines that contain ONLY numbers
It's unclear whether you mean numbers or just 0-9. Here's a Perl one-liner that picks out the likes of 123, 3.14 and 1e-12 while ignoring various representations of infinity and not-a-number:
$ perl -MScalar::Util -ne 'chomp; if (!(m/^s/ || m/^[+-]?inf(?:inity)?$/i || m/^nan$/i) && Scalar::Util::looks_like_number($_)) print("N:"); print("$_n");' <x
a
N:123
N:+1
N:-1
1
b
1a
N:3.14
c
3.1415926 is an approximation of pi
N:1e-12
inf
Inf
Infinity
Infinity +1 sword
+Infinity
-infinity
NaN
1/2
I changed the prefix to "N:" simply because "number--1" looks a bit rubbish. Note that this treats " 1", for example, as not numeric. If that is undesirable behaviour, do not include the "m/^s/" test for leading whitespace.
If you mean "0-9", Sergiy's sed solution above is fine.
answered Mar 29 at 11:56
Chris WilliamsChris Williams
311
Probably an overkill for this question, but still awesome ! +1
– Sergiy Kolodyazhnyy
Mar 29 at 12:06
add a comment |
lines that contain ONLY numbers
It's unclear whether you mean numbers or just 0-9. Here's a Perl one-liner that picks out the likes of 123, 3.14 and 1e-12 while ignoring various representations of infinity and not-a-number:
$ perl -MScalar::Util -ne 'chomp; if (!(m/^s/ || m/^[+-]?inf(?:inity)?$/i || m/^nan$/i) && Scalar::Util::looks_like_number($_)) print("N:"); print("$_n");' <x
a
N:123
N:+1
N:-1
1
b
1a
N:3.14
c
3.1415926 is an approximation of pi
N:1e-12
inf
Inf
Infinity
Infinity +1 sword
+Infinity
-infinity
NaN
1/2
I changed the prefix to "N:" simply because "number--1" looks a bit rubbish. Note that this treats " 1", for example, as not numeric. If that is undesirable behaviour, do not include the "m/^s/" test for leading whitespace.
If you mean "0-9", Sergiy's sed solution above is fine.
answered Mar 29 at 11:56
Chris WilliamsChris Williams
311
Probably an overkill for this question, but still awesome ! +1
– Sergiy Kolodyazhnyy
Mar 29 at 12:06
add a comment |
lines that contain ONLY numbers
It's unclear whether you mean numbers or just 0-9. Here's a Perl one-liner that picks out the likes of 123, 3.14 and 1e-12 while ignoring various representations of infinity and not-a-number:
$ perl -MScalar::Util -ne 'chomp; if (!(m/^s/ || m/^[+-]?inf(?:inity)?$/i || m/^nan$/i) && Scalar::Util::looks_like_number($_)) print("N:"); print("$_n");' <x
a
N:123
N:+1
N:-1
1
b
1a
N:3.14
c
3.1415926 is an approximation of pi
N:1e-12
inf
Inf
Infinity
Infinity +1 sword
+Infinity
-infinity
NaN
1/2
I changed the prefix to "N:" simply because "number--1" looks a bit rubbish. Note that this treats " 1", for example, as not numeric. If that is undesirable behaviour, do not include the "m/^s/" test for leading whitespace.
If you mean "0-9", Sergiy's sed solution above is fine.
answered Mar 29 at 11:56
Chris WilliamsChris Williams
311
lines that contain ONLY numbers
It's unclear whether you mean numbers or just 0-9. Here's a Perl one-liner that picks out the likes of 123, 3.14 and 1e-12 while ignoring various representations of infinity and not-a-number:
$ perl -MScalar::Util -ne 'chomp; if (!(m/^s/ || m/^[+-]?inf(?:inity)?$/i || m/^nan$/i) && Scalar::Util::looks_like_number($_)) print("N:"); print("$_n");' <x
a
N:123
N:+1
N:-1
1
b
1a
N:3.14
c
3.1415926 is an approximation of pi
N:1e-12
inf
Inf
Infinity
Infinity +1 sword
+Infinity
-infinity
NaN
1/2
I changed the prefix to "N:" simply because "number--1" looks a bit rubbish. Note that this treats " 1", for example, as not numeric. If that is undesirable behaviour, do not include the "m/^s/" test for leading whitespace.
If you mean "0-9", Sergiy's sed solution above is fine.
answered Mar 29 at 11:56
Chris WilliamsChris Williams
311
answered Mar 29 at 11:56
Chris WilliamsChris Williams
311
answered Mar 29 at 11:56
Chris WilliamsChris Williams
311
answered Mar 29 at 11:56
Chris WilliamsChris Williams
311
311
Probably an overkill for this question, but still awesome ! +1
– Sergiy Kolodyazhnyy
Mar 29 at 12:06
add a comment |
Probably an overkill for this question, but still awesome ! +1
– Sergiy Kolodyazhnyy
Mar 29 at 12:06
Probably an overkill for this question, but still awesome ! +1
– Sergiy Kolodyazhnyy
Mar 29 at 12:06
Probably an overkill for this question, but still awesome ! +1
– Sergiy Kolodyazhnyy
Mar 29 at 12:06
add a comment |
You can try this
$cat input.txt
Series
Of
Word
73914
Again
Word
$awk ' if($1 ~/[0-9]/) printf "number - %sn",$1; else print $1 ' input.txt
Series
Of
Word
number - 73914
Again
Word
answered Mar 29 at 7:26
GoronGoron
1719
Usingifstatement, nice ! Thank you :D
– Jim
Mar 29 at 9:42
add a comment |
You can try this
$cat input.txt
Series
Of
Word
73914
Again
Word
$awk ' if($1 ~/[0-9]/) printf "number - %sn",$1; else print $1 ' input.txt
Series
Of
Word
number - 73914
Again
Word
answered Mar 29 at 7:26
GoronGoron
1719
Usingifstatement, nice ! Thank you :D
– Jim
Mar 29 at 9:42
add a comment |
You can try this
$cat input.txt
Series
Of
Word
73914
Again
Word
$awk ' if($1 ~/[0-9]/) printf "number - %sn",$1; else print $1 ' input.txt
Series
Of
Word
number - 73914
Again
Word
answered Mar 29 at 7:26
GoronGoron
1719
You can try this
$cat input.txt
Series
Of
Word
73914
Again
Word
$awk ' if($1 ~/[0-9]/) printf "number - %sn",$1; else print $1 ' input.txt
Series
Of
Word
number - 73914
Again
Word
answered Mar 29 at 7:26
GoronGoron
1719
answered Mar 29 at 7:26
GoronGoron
1719
answered Mar 29 at 7:26
GoronGoron
1719
answered Mar 29 at 7:26
GoronGoron
1719
1719
Usingifstatement, nice ! Thank you :D
– Jim
Mar 29 at 9:42
add a comment |
Usingifstatement, nice ! Thank you :D
– Jim
Mar 29 at 9:42
Using
if statement, nice ! Thank you :D– Jim
Mar 29 at 9:42
Using
if statement, nice ! Thank you :D– Jim
Mar 29 at 9:42
add a comment |
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What do you want to do with a line like
1st word 2nd word?– glenn jackman
Mar 29 at 18:00
And do you want only lines that are entirely a number or that start with a number? E.g. would you want
123abcto be changed tonumber-123abcor not?– Kevin
Mar 29 at 19:57