How to filter and redirect output

up vote
1
down vote

favorite

I have a command which will produce lots of output to STDOUT, which I know can be redirected into a file this way:

./myCMD 1>tmp

How can the output be filtered before redirecting it into the file. For example, I would want to redirect only those lines of output which contain some key word.

edited Mar 7 at 10:01

user1404316

2,314520

asked Mar 7 at 9:06

Yves

705414

add a commentÂ |Â

up vote
1
down vote

favorite

I have a command which will produce lots of output to STDOUT, which I know can be redirected into a file this way:

./myCMD 1>tmp

How can the output be filtered before redirecting it into the file. For example, I would want to redirect only those lines of output which contain some key word.

edited Mar 7 at 10:01

user1404316

2,314520

asked Mar 7 at 9:06

Yves

705414

add a commentÂ |Â

up vote
1
down vote

favorite

I have a command which will produce lots of output to STDOUT, which I know can be redirected into a file this way:

./myCMD 1>tmp

How can the output be filtered before redirecting it into the file. For example, I would want to redirect only those lines of output which contain some key word.

edited Mar 7 at 10:01

user1404316

2,314520

asked Mar 7 at 9:06

Yves

705414

I have a command which will produce lots of output to STDOUT, which I know can be redirected into a file this way:

./myCMD 1>tmp

How can the output be filtered before redirecting it into the file. For example, I would want to redirect only those lines of output which contain some key word.

edited Mar 7 at 10:01

user1404316

2,314520

asked Mar 7 at 9:06

Yves

705414

edited Mar 7 at 10:01

user1404316

2,314520

edited Mar 7 at 10:01

user1404316

2,314520

edited Mar 7 at 10:01

user1404316

2,314520

asked Mar 7 at 9:06

Yves

705414

asked Mar 7 at 9:06

Yves

705414

asked Mar 7 at 9:06

Yves

705414

add a commentÂ |Â

2 Answers
2

active

oldest

votes

up vote
1
down vote

accepted

If you mean that you only want some lines to go to the tmp file, while the rest are left untouched:

cmd | awk '/pattern/ print > "tmp"; next
 print'

Or:

cmd | sed '/pattern/!b
 w tmp
 d'

(on one line: cmd | sed -e '/pattern/!b' -e 'w tmp' -e d)

Or:

cmd | sed '/pattern/ 
 w tmp
 d
 '

(on one line: cmd | sed -e '/pattern/w tmp' -e 'd;')

Note that for sed, pattern is a basic regular expression, while for awk, it's an extended regular expression.

answered Mar 7 at 10:34

StÃ©phane Chazelas

280k53515847

add a commentÂ |Â

up vote
2
down vote

You can do this with pipes:

./myCMD | grep keyword > tmp

This will only write lines containing Ã¢Â€ÂœkeywordÃ¢Â€Â to the tmp file.

answered Mar 7 at 9:08

Stephen Kitt

141k22307367

add a commentÂ |Â

Your Answer

StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "106"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);

else
createEditor();

);

function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
convertImagesToLinks: false,
noModals: false,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);

);

draft saved

draft discarded

StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f428695%2fhow-to-filter-and-redirect-output%23new-answer', 'question_page');

);

Post as a guest

Name

2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

up vote
1
down vote

accepted

If you mean that you only want some lines to go to the tmp file, while the rest are left untouched:

cmd | awk '/pattern/ print > "tmp"; next
 print'

Or:

cmd | sed '/pattern/!b
 w tmp
 d'

(on one line: cmd | sed -e '/pattern/!b' -e 'w tmp' -e d)

Or:

cmd | sed '/pattern/ 
 w tmp
 d
 '

(on one line: cmd | sed -e '/pattern/w tmp' -e 'd;')

Note that for sed, pattern is a basic regular expression, while for awk, it's an extended regular expression.

answered Mar 7 at 10:34

StÃ©phane Chazelas

280k53515847

add a commentÂ |Â

up vote
1
down vote

accepted

If you mean that you only want some lines to go to the tmp file, while the rest are left untouched:

cmd | awk '/pattern/ print > "tmp"; next
 print'

Or:

cmd | sed '/pattern/!b
 w tmp
 d'

(on one line: cmd | sed -e '/pattern/!b' -e 'w tmp' -e d)

Or:

cmd | sed '/pattern/ 
 w tmp
 d
 '

(on one line: cmd | sed -e '/pattern/w tmp' -e 'd;')

Note that for sed, pattern is a basic regular expression, while for awk, it's an extended regular expression.

answered Mar 7 at 10:34

StÃ©phane Chazelas

280k53515847

add a commentÂ |Â

up vote
1
down vote

accepted

If you mean that you only want some lines to go to the tmp file, while the rest are left untouched:

cmd | awk '/pattern/ print > "tmp"; next
 print'

Or:

cmd | sed '/pattern/!b
 w tmp
 d'

(on one line: cmd | sed -e '/pattern/!b' -e 'w tmp' -e d)

Or:

cmd | sed '/pattern/ 
 w tmp
 d
 '

(on one line: cmd | sed -e '/pattern/w tmp' -e 'd;')

Note that for sed, pattern is a basic regular expression, while for awk, it's an extended regular expression.

answered Mar 7 at 10:34

StÃ©phane Chazelas

280k53515847

If you mean that you only want some lines to go to the tmp file, while the rest are left untouched:

cmd | awk '/pattern/ print > "tmp"; next
 print'

Or:

cmd | sed '/pattern/!b
 w tmp
 d'

(on one line: cmd | sed -e '/pattern/!b' -e 'w tmp' -e d)

Or:

cmd | sed '/pattern/ 
 w tmp
 d
 '

(on one line: cmd | sed -e '/pattern/w tmp' -e 'd;')

Note that for sed, pattern is a basic regular expression, while for awk, it's an extended regular expression.

answered Mar 7 at 10:34

280k53515847

answered Mar 7 at 10:34

280k53515847

answered Mar 7 at 10:34

280k53515847

answered Mar 7 at 10:34

280k53515847

add a commentÂ |Â

up vote
2
down vote

You can do this with pipes:

./myCMD | grep keyword > tmp

This will only write lines containing Ã¢Â€ÂœkeywordÃ¢Â€Â to the tmp file.

answered Mar 7 at 9:08

Stephen Kitt

141k22307367

add a commentÂ |Â

up vote
2
down vote

You can do this with pipes:

./myCMD | grep keyword > tmp

This will only write lines containing Ã¢Â€ÂœkeywordÃ¢Â€Â to the tmp file.

answered Mar 7 at 9:08

Stephen Kitt

141k22307367

add a commentÂ |Â

up vote
2
down vote

You can do this with pipes:

./myCMD | grep keyword > tmp

This will only write lines containing Ã¢Â€ÂœkeywordÃ¢Â€Â to the tmp file.

answered Mar 7 at 9:08

Stephen Kitt

141k22307367

You can do this with pipes:

./myCMD | grep keyword > tmp

This will only write lines containing Ã¢Â€ÂœkeywordÃ¢Â€Â to the tmp file.

answered Mar 7 at 9:08

Stephen Kitt

141k22307367

answered Mar 7 at 9:08

Stephen Kitt

141k22307367

answered Mar 7 at 9:08

Stephen Kitt

141k22307367

answered Mar 7 at 9:08

Stephen Kitt

141k22307367

add a commentÂ |Â

draft saved

draft discarded

draft saved

draft discarded

Post as a guest

Name

搜尋此網誌

mjhjmtu