tldr/pages/common/sed.md

# sed

> Edit text in a scriptable manner.

- Replace the first occurrence of a regular expression in each line of a file, and print the result:

`sed 's/{{regex}}/{{replace}}/' {{filename}}`

- Replace all occurrences of an extended regular expression in a file, and print the result:

`sed -r 's/{{regex}}/{{replace}}/g' {{filename}}`

- Replace all occurrences of a string in a file, overwriting the file (i.e. in-place):

`sed -i 's/{{find}}/{{replace}}/g' {{filename}}`

- Replace only on lines matching the line pattern:

`sed '/{{line_pattern}}/s/{{find}}/{{replace}}/' {{filename}}`

- Delete lines matching the line pattern:

`sed '/{{line_pattern}}/d' {{filename}}`

- Print only text between n-th line till the next empty line:

`sed -n '{{n}},/^$/p' {{filename}}`

- Apply multiple find-replace expressions to a file:

`sed -e 's/{{find}}/{{replace}}/' -e 's/{{find}}/{{replace}}/' {{filename}}`

- Replace separator / by any other character not used in the find or replace patterns, e.g., #:

`sed 's#{{find}}#{{replace}}#' {{filename}}`

- Print only the n-th line of a file:

`sed '{{n}}q;d' {{filename}}`
Add doc for sed(1) 2013-12-11 10:50:11 +00:00			`# sed`

sed: show usage of a print command (#2154) 2018-06-26 16:19:31 +01:00			`> Edit text in a scriptable manner.`
Add doc for sed(1) 2013-12-11 10:50:11 +00:00
sed: fix misleading examples description. (#2685) 2019-01-08 18:28:59 +00:00			`- Replace the first occurrence of a regular expression in each line of a file, and print the result:`
Add doc for sed(1) 2013-12-11 10:50:11 +00:00
sed: fix misleading examples description. (#2685) 2019-01-08 18:28:59 +00:00			`sed 's/{{regex}}/{{replace}}/' {{filename}}`
Add doc for sed(1) 2013-12-11 10:50:11 +00:00
sed: fix misleading examples description. (#2685) 2019-01-08 18:28:59 +00:00			`- Replace all occurrences of an extended regular expression in a file, and print the result:`
Sed: adds replace before matching sample Something I find myself doing more and more is to match on a line instead of trying to match all I want with `{{find}}`. So in a file like: ```erl { riak_core, [ { {riak_ip, "127.0.0.1"}, %% ... }, %% ... ] ``` Instead of replacing that ip by doing `sed 's/riak_ip,"127\.0\.0\.1/riak_ip,"$NEW_IP/'`, I do `sed '/riak_ip/s/127\.0\.0\.1/$NEW_IP'`. 2016-02-27 13:23:24 +00:00
sed: swap extended regex & line pattern examples 2016-04-21 19:13:01 +01:00			`sed -r 's/{{regex}}/{{replace}}/g' {{filename}}`
Sed: adds replace before matching sample Something I find myself doing more and more is to match on a line instead of trying to match all I want with `{{find}}`. So in a file like: ```erl { riak_core, [ { {riak_ip, "127.0.0.1"}, %% ... }, %% ... ] ``` Instead of replacing that ip by doing `sed 's/riak_ip,"127\.0\.0\.1/riak_ip,"$NEW_IP/'`, I do `sed '/riak_ip/s/127\.0\.0\.1/$NEW_IP'`. 2016-02-27 13:23:24 +00:00
Formatted sed page 2016-01-21 12:02:00 +00:00			`- Replace all occurrences of a string in a file, overwriting the file (i.e. in-place):`
Add doc for sed(1) 2013-12-11 10:50:11 +00:00
Update sed.md Error on the command. 2015-11-23 15:05:25 +00:00			`sed -i 's/{{find}}/{{replace}}/g' {{filename}}`
Add doc for sed(1) 2013-12-11 10:50:11 +00:00
sed: swap extended regex & line pattern examples 2016-04-21 19:13:01 +01:00			`- Replace only on lines matching the line pattern:`
Add doc for sed(1) 2013-12-11 10:50:11 +00:00
sed.md: add input to the only example missing it (#992) * sed.md: add input to the only example missing it * osx/sed.md: add input to the example missing it 2016-08-08 08:09:34 +01:00			`sed '/{{line_pattern}}/s/{{find}}/{{replace}}/' {{filename}}`
Adding a line for sed for making multiple replacements in one command. 2014-03-27 18:27:35 +00:00
sed: Add example to delete lines (#2596) 2018-11-16 14:11:22 +00:00			`- Delete lines matching the line pattern:`

			`sed '/{{line_pattern}}/d' {{filename}}`

sed: show usage of a print command (#2154) 2018-06-26 16:19:31 +01:00			`- Print only text between n-th line till the next empty line:`

sed: minor syntax fix 2019-04-08 23:49:58 +01:00			`sed -n '{{n}},/^$/p' {{filename}}`
sed: show usage of a print command (#2154) 2018-06-26 16:19:31 +01:00
Formatted sed page 2016-01-21 12:02:00 +00:00			`- Apply multiple find-replace expressions to a file:`
sed: fix md syntax 2014-05-17 23:12:37 +01:00
various fixes and tweaks to sed - don't use g in all examples - fix option for extended regex (-E is in grep :)) - spell out the -i option and remove a stray `''` from that command - use the term "expressions" in the example using -e 2015-08-20 16:59:41 +01:00			`sed -e 's/{{find}}/{{replace}}/' -e 's/{{find}}/{{replace}}/' {{filename}}`
sed.md: use alternative separators (#806) 2016-04-10 20:18:24 +01:00
sed: reword last example and add it to the osx version too 2016-04-21 19:11:33 +01:00			`- Replace separator / by any other character not used in the find or replace patterns, e.g., #:`
sed.md: use alternative separators (#806) 2016-04-10 20:18:24 +01:00
			`sed 's#{{find}}#{{replace}}#' {{filename}}`
sed: get nth line of a file 2018-08-22 22:26:12 +01:00
sed: minor syntax fix 2019-04-08 23:49:58 +01:00			`- Print only the n-th line of a file:`
sed: get nth line of a file 2018-08-22 22:26:12 +01:00
sed: minor syntax fix 2019-04-08 23:49:58 +01:00			`sed '{{n}}q;d' {{filename}}`