Sed (editor)

sed utility is using for text processing, such as strings replacements.

Sed Basic examples

• Append a text (TEST_TO_APPEND_AT_BEGINNIG) at the beginning of a line: sed -i s/^/TEST_TO_APPEND_AT_BEGINNIG/ file.txt
• Append a text (TEST_TO_APPEND_AT_END) at the end of a line: sed -i s/$/TEST_TO_APPEND_AT_END/ file.txt
• Move N files from text file to new file:head -1000 input > output && sed -i '1,+999d' input

See also

• vi (editor)
• ack, ag, grep, egrep, fgrep, agrep, ngrep, pgrep, awk, sed, strings, tr, tail, mtail, git grep, wc, uniq, LogQL, findstr (Windows), rg, git-grep, cut
• Ansible lineinfile module

https://stackoverflow.com/a/801036