grep_cheatsheet

grep_cheatsheet.txt

# select lines which start with upper case or lower case letter at the start of the line
grep -E "^[a-z]|[A-Z]"

# enable line buffering (useful for dealing with pipes and real time loops)
grep --line-buffered "search term"

# enable highlighting for a match but do not filter output (all of these examples will have a similar effect)
ack --passthru 'hightlight-match-string'
grep "^\|highlight-match-string" --color="always"
grep "^\|highlight-match-string" --color
grep "^\|highlight-match-string"
grep "\|highlight-match-string"

# use sponge to soak up a file and then write back to the same file (grep goodnes)
cat remove_lines_from_me.txt | grep -vx --fixed-strings --file=delete_pattern_file_one_per_line.pattern | sponge remove_lins_from_me.txt