Linux/Unix:Find and Replace
cat
head tail
Show only top or trailing line from a file
- tail <num> filename
- Show the last <num> lines from filename. 10 is the default
- head -<num> filename
- Show the first <num> lines from filename. 10 is the default
- tail +<num> filename
- Show all lines from line <num> onwards
- tail +<lineno> filename|head -<num>
- show <num> lines starting at <lineno>
fold
strings
more less
tr
- tr "[:upper:]" "[:lower:]"
- tr "[abc]" "[xyz]"
- Transtlate, make all lowercase
- replace all a's with y, all b's with y and all c's with z, works from stdin to stdout. All sort of translations can be done
- tr -d <char>
- Delete <char> from standard input
grep
sed
- s/pattern/newstring/
- In each line replace first occurrence of pattern with newstring. /g at the end replaces all occurrences of pattern.
- s/pattern/d
- Delete each line matching pattern.