Only print output after finding pattern
There's a script (let's call it echoer) that prints to screen a bunch of information. I'd like to be able to only see lines after a pattern is found.
I imagine the usage of a solution to look something like
echoer | solution_command <pattern>
Ideally pattern would be a regular expression, but hard value strings would be enough for me.
echo printf
asked 1 hour ago
user23146user23146
83
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user23146 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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add a comment |
There's a script (let's call it echoer) that prints to screen a bunch of information. I'd like to be able to only see lines after a pattern is found.
I imagine the usage of a solution to look something like
echoer | solution_command <pattern>
Ideally pattern would be a regular expression, but hard value strings would be enough for me.
echo printf
asked 1 hour ago
user23146user23146
83
New contributor
user23146 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
So pattern can be multiple strings?
– Inian
1 hour ago
A glob? Do you mean a regular expression? Globs only make sense for file name expansions.
– terdon♦
55 mins ago
@Inian I'm not sure I understand the question. Do you mean to ask if I want this to work with disjunctions?
– user23146
39 mins ago
add a comment |
There's a script (let's call it echoer) that prints to screen a bunch of information. I'd like to be able to only see lines after a pattern is found.
I imagine the usage of a solution to look something like
echoer | solution_command <pattern>
Ideally pattern would be a regular expression, but hard value strings would be enough for me.
echo printf
asked 1 hour ago
user23146user23146
83
New contributor
user23146 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
There's a script (let's call it echoer) that prints to screen a bunch of information. I'd like to be able to only see lines after a pattern is found.
I imagine the usage of a solution to look something like
echoer | solution_command <pattern>
Ideally pattern would be a regular expression, but hard value strings would be enough for me.
echo printf
echo printf
asked 1 hour ago
user23146user23146
83
New contributor
user23146 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 hour ago
user23146user23146
83
New contributor
user23146 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 40 mins ago
user23146
asked 1 hour ago
user23146user23146
83
New contributor
user23146 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 hour ago
user23146user23146
83
asked 1 hour ago
user23146user23146
83
83
New contributor
user23146 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
user23146 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
user23146 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
So pattern can be multiple strings?
– Inian
1 hour ago
A glob? Do you mean a regular expression? Globs only make sense for file name expansions.
– terdon♦
55 mins ago
@Inian I'm not sure I understand the question. Do you mean to ask if I want this to work with disjunctions?
– user23146
39 mins ago
add a comment |
So pattern can be multiple strings?
– Inian
1 hour ago
A glob? Do you mean a regular expression? Globs only make sense for file name expansions.
– terdon♦
55 mins ago
@Inian I'm not sure I understand the question. Do you mean to ask if I want this to work with disjunctions?
– user23146
39 mins ago
So pattern can be multiple strings?
– Inian
1 hour ago
So pattern can be multiple strings?
– Inian
1 hour ago
A glob? Do you mean a regular expression? Globs only make sense for file name expansions.
– terdon♦
55 mins ago
A glob? Do you mean a regular expression? Globs only make sense for file name expansions.
– terdon♦
55 mins ago
@Inian I'm not sure I understand the question. Do you mean to ask if I want this to work with disjunctions?
– user23146
39 mins ago
@Inian I'm not sure I understand the question. Do you mean to ask if I want this to work with disjunctions?
– user23146
39 mins ago
add a comment |
1 Answer
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AWK can do this with pattern ranges, which allows the use of any regular expression:
echoer | awk '/pattern/,0'
will print echoer’s output starting with the first line matching pattern.
AWK is pattern-based, and is typically used with a “if this pattern matches, do this” type of approach. “This pattern” can be a range of patterns, defined as “when this pattern matches, start going this, until this other pattern matches”; this is specified by writing two patterns separated by a comma, as above. Patterns can be text matches, as in /pattern/, where the current line is checked against the pattern, interpreted as a regular expression; they can also be general expressions, evaluated for every line, and considered to match if their result is non-zero or non-empty.
In AWK, the default action is to print the current line.
Putting all this together, awk '/pattern/,0' looks for lines matching pattern, and once it finds one, applies the default action to all lines until the 0 condition matches (is non-zero). awk '/pattern/,""' would work too.
The Gawk manual goes into much more detail.
answered 56 mins ago
Stephen KittStephen Kitt
178k24405482
Thanks. This works. Any chance you can breakdown the syntax for those who don't know AWK? I know AWK operates line by line and it is triggered by matching the input pattern, but that's about it.
– user23146
36 mins ago
1
I was not aware of the range semantics with zero as the end of the range. Thanks!
– Kusalananda♦
36 mins ago
@user23146 I’ve tried to explain a bit better.
– Stephen Kitt
15 mins ago
@StephenKitt This is great! What if I wanted to print until it matched0? Would it be/pattern/,/0/? What would the answer look like explicitly writing out the default action?
– user23146
10 mins ago
add a comment |
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1 Answer
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1 Answer
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votes
AWK can do this with pattern ranges, which allows the use of any regular expression:
echoer | awk '/pattern/,0'
will print echoer’s output starting with the first line matching pattern.
AWK is pattern-based, and is typically used with a “if this pattern matches, do this” type of approach. “This pattern” can be a range of patterns, defined as “when this pattern matches, start going this, until this other pattern matches”; this is specified by writing two patterns separated by a comma, as above. Patterns can be text matches, as in /pattern/, where the current line is checked against the pattern, interpreted as a regular expression; they can also be general expressions, evaluated for every line, and considered to match if their result is non-zero or non-empty.
In AWK, the default action is to print the current line.
Putting all this together, awk '/pattern/,0' looks for lines matching pattern, and once it finds one, applies the default action to all lines until the 0 condition matches (is non-zero). awk '/pattern/,""' would work too.
The Gawk manual goes into much more detail.
answered 56 mins ago
Stephen KittStephen Kitt
178k24405482
Thanks. This works. Any chance you can breakdown the syntax for those who don't know AWK? I know AWK operates line by line and it is triggered by matching the input pattern, but that's about it.
– user23146
36 mins ago
1
I was not aware of the range semantics with zero as the end of the range. Thanks!
– Kusalananda♦
36 mins ago
@user23146 I’ve tried to explain a bit better.
– Stephen Kitt
15 mins ago
@StephenKitt This is great! What if I wanted to print until it matched0? Would it be/pattern/,/0/? What would the answer look like explicitly writing out the default action?
– user23146
10 mins ago
add a comment |
AWK can do this with pattern ranges, which allows the use of any regular expression:
echoer | awk '/pattern/,0'
will print echoer’s output starting with the first line matching pattern.
AWK is pattern-based, and is typically used with a “if this pattern matches, do this” type of approach. “This pattern” can be a range of patterns, defined as “when this pattern matches, start going this, until this other pattern matches”; this is specified by writing two patterns separated by a comma, as above. Patterns can be text matches, as in /pattern/, where the current line is checked against the pattern, interpreted as a regular expression; they can also be general expressions, evaluated for every line, and considered to match if their result is non-zero or non-empty.
In AWK, the default action is to print the current line.
Putting all this together, awk '/pattern/,0' looks for lines matching pattern, and once it finds one, applies the default action to all lines until the 0 condition matches (is non-zero). awk '/pattern/,""' would work too.
The Gawk manual goes into much more detail.
answered 56 mins ago
Stephen KittStephen Kitt
178k24405482
Thanks. This works. Any chance you can breakdown the syntax for those who don't know AWK? I know AWK operates line by line and it is triggered by matching the input pattern, but that's about it.
– user23146
36 mins ago
1
I was not aware of the range semantics with zero as the end of the range. Thanks!
– Kusalananda♦
36 mins ago
@user23146 I’ve tried to explain a bit better.
– Stephen Kitt
15 mins ago
@StephenKitt This is great! What if I wanted to print until it matched0? Would it be/pattern/,/0/? What would the answer look like explicitly writing out the default action?
– user23146
10 mins ago
add a comment |
AWK can do this with pattern ranges, which allows the use of any regular expression:
echoer | awk '/pattern/,0'
will print echoer’s output starting with the first line matching pattern.
AWK is pattern-based, and is typically used with a “if this pattern matches, do this” type of approach. “This pattern” can be a range of patterns, defined as “when this pattern matches, start going this, until this other pattern matches”; this is specified by writing two patterns separated by a comma, as above. Patterns can be text matches, as in /pattern/, where the current line is checked against the pattern, interpreted as a regular expression; they can also be general expressions, evaluated for every line, and considered to match if their result is non-zero or non-empty.
In AWK, the default action is to print the current line.
Putting all this together, awk '/pattern/,0' looks for lines matching pattern, and once it finds one, applies the default action to all lines until the 0 condition matches (is non-zero). awk '/pattern/,""' would work too.
The Gawk manual goes into much more detail.
answered 56 mins ago
Stephen KittStephen Kitt
178k24405482
AWK can do this with pattern ranges, which allows the use of any regular expression:
echoer | awk '/pattern/,0'
will print echoer’s output starting with the first line matching pattern.
AWK is pattern-based, and is typically used with a “if this pattern matches, do this” type of approach. “This pattern” can be a range of patterns, defined as “when this pattern matches, start going this, until this other pattern matches”; this is specified by writing two patterns separated by a comma, as above. Patterns can be text matches, as in /pattern/, where the current line is checked against the pattern, interpreted as a regular expression; they can also be general expressions, evaluated for every line, and considered to match if their result is non-zero or non-empty.
In AWK, the default action is to print the current line.
Putting all this together, awk '/pattern/,0' looks for lines matching pattern, and once it finds one, applies the default action to all lines until the 0 condition matches (is non-zero). awk '/pattern/,""' would work too.
The Gawk manual goes into much more detail.
answered 56 mins ago
Stephen KittStephen Kitt
178k24405482
edited 15 mins ago
answered 56 mins ago
Stephen KittStephen Kitt
178k24405482
answered 56 mins ago
Stephen KittStephen Kitt
178k24405482
answered 56 mins ago
Stephen KittStephen Kitt
178k24405482
178k24405482
Thanks. This works. Any chance you can breakdown the syntax for those who don't know AWK? I know AWK operates line by line and it is triggered by matching the input pattern, but that's about it.
– user23146
36 mins ago
1
I was not aware of the range semantics with zero as the end of the range. Thanks!
– Kusalananda♦
36 mins ago
@user23146 I’ve tried to explain a bit better.
– Stephen Kitt
15 mins ago
@StephenKitt This is great! What if I wanted to print until it matched0? Would it be/pattern/,/0/? What would the answer look like explicitly writing out the default action?
– user23146
10 mins ago
add a comment |
Thanks. This works. Any chance you can breakdown the syntax for those who don't know AWK? I know AWK operates line by line and it is triggered by matching the input pattern, but that's about it.
– user23146
36 mins ago
1
I was not aware of the range semantics with zero as the end of the range. Thanks!
– Kusalananda♦
36 mins ago
@user23146 I’ve tried to explain a bit better.
– Stephen Kitt
15 mins ago
@StephenKitt This is great! What if I wanted to print until it matched0? Would it be/pattern/,/0/? What would the answer look like explicitly writing out the default action?
– user23146
10 mins ago
Thanks. This works. Any chance you can breakdown the syntax for those who don't know AWK? I know AWK operates line by line and it is triggered by matching the input pattern, but that's about it.
– user23146
36 mins ago
Thanks. This works. Any chance you can breakdown the syntax for those who don't know AWK? I know AWK operates line by line and it is triggered by matching the input pattern, but that's about it.
– user23146
36 mins ago
1
1
I was not aware of the range semantics with zero as the end of the range. Thanks!
– Kusalananda♦
36 mins ago
I was not aware of the range semantics with zero as the end of the range. Thanks!
– Kusalananda♦
36 mins ago
@user23146 I’ve tried to explain a bit better.
– Stephen Kitt
15 mins ago
@user23146 I’ve tried to explain a bit better.
– Stephen Kitt
15 mins ago
@StephenKitt This is great! What if I wanted to print until it matched
0? Would it be /pattern/,/0/? What would the answer look like explicitly writing out the default action?– user23146
10 mins ago
@StephenKitt This is great! What if I wanted to print until it matched
0? Would it be /pattern/,/0/? What would the answer look like explicitly writing out the default action?– user23146
10 mins ago
add a comment |
user23146 is a new contributor. Be nice, and check out our Code of Conduct.
user23146 is a new contributor. Be nice, and check out our Code of Conduct.
user23146 is a new contributor. Be nice, and check out our Code of Conduct.
user23146 is a new contributor. Be nice, and check out our Code of Conduct.
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So pattern can be multiple strings?
– Inian
1 hour ago
A glob? Do you mean a regular expression? Globs only make sense for file name expansions.
– terdon♦
55 mins ago
@Inian I'm not sure I understand the question. Do you mean to ask if I want this to work with disjunctions?
– user23146
39 mins ago