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(on Wikipedia)
https://www.gnu.org/software/sed/ [ 1 ]

Generally used to do search/replace on strings, but also in text files.

• tutorial: do it with sed

• Useful one-line scripts for sed:

  • https://web.archive.org/web/20220913085754/http://sed.sourceforge.net/sed1line.txt
  • https://www.pement.org/sed/sed1line.txt

• https://www.pement.org/sed/

Delete the end off of filenames ∞

The equivalent of some sort of DOS-style mv *sed- \1

ls -d *sed- | sed 's/\(.*\).sed-$/mv "&" "\1"/' | sh

dos2unix ∞

Instead of dos2unix, do:

sed 's/^M$//' < dos.txt > unix.text

sed 's/.$//' < dos.txt > unix.text

unix2dos ∞

Instead of unix2dos, do:

sed 's/$/^M/' < unix.text > dos.txt

Footer removal ∞

A sed script to remove the footer from an email.

#!/bin/sh
footstart="_______________________________________________________________"
footend="REMOVE THIS FOOTER FROM YOUR QUOTES"
sed -e "/$footstart/,/$footend/d"

My take on this:

Clean up this command:

rsync --dry-run -vrlt /source/dir /dest/dir > filename.txt

sending incremental file list
./
index.htm
index.txt
test.html

sent 89 bytes  received 24 bytes  226.00 bytes/sec
total size is 164  speedup is 1.45 (DRY RUN)

footstart="sending incremental file list"
footend="\.\/"
sed -e "/$footstart/,/$footend/d" < filename.txt > filename2.txt

footstart="^$"
footend="^total size is * speedup is * (DRY RUN)"
sed -e "/$footstart/,/$footend/d" < filename2.txt

Regular expressions ∞

See Regular expressions.

Something I used for YouTube RSS feeds:

sed 's*.\**<outline title="Videos uploaded by \0" text="Videos uploaded by \0" type="rss" version="RSS" xmlUrl="http://www.youtube.com/rss/user/\0/videos.rss" htmlUrl="http://www.youtube.com/profile_videos?user=\0"/>*' ~/subs-nofaves.txt > ~/subs-nofaves2.txt

Search/replace a string in an echo/variable ∞

\echo 'source string'  |  \sed  --expression='s/source/target/'

Search/replace a string in a file ∞

This modifies the file in-place (essentially overwriting it). Make a backup first.

Basic ∞

\sed  --in-place         --expression='s/source/target/g' filename.txt
# This makes a backup automatically
\sed  --in-place='.bak'  --expression='s/source/target/g' filename.txt

Search/replace strings in many file, using slashes ∞

Replace the use of / with |

for i in *  ;  do  \sed  --in-place  --expression='s|/path/to|/new/path/to|g' "$i"  ;  done

Last updated 2022-10-16 at 04:37:34

Footnotes