sed
sed is a Unix utility that parses and transforms text, using a simple, compact programming language.
Using named blocks to delete text
cat << EOF > text
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Ut eu metus id lectus vestibulum ultrices. Maecenas rhoncus.
EOF
(out)
sed 's/^.*\(consectetuer.*elit\).*$/\1/' text
(out)
(out) consectetuer adipiscing elit
s/^.* - substitute starting at the beginning of the line (^) followed by anything (.*) up to…\( - start a named blockconsectetuer.*elit\. - match the first word, everything (.*) up to the last word (in this case, including the trailing (escaped)dot) you want to match\) - end the named block- match everything else (
.*) to the end of the line ($)
/ - end the substitute find section\1 - replace with the name block between the \( and the \) above/ - end the replace
Quick reference
| Command |
Description |
sed '/^$/d' |
Remove blank lines |
sed '/^ /d' |
Remove lines starting with two spaces |
sed 's/^textToRemove//g' |
Remove text |
echo "text::to::remove [TECAN,Text to Keep]" | sed "s/text::to::remove \[TECAN,//" | sed "s/\]//" |
Remove text |