Some Useful SED One-Liners

Some Useful SED One-Liners

 # Emit the first 10 lines of a file (such as 'head')     sed 10q file.txt     # Emit a double-spaced version of the file     sed 'G' file.txt     # Emit number of lines in input file     sed -n '$=' file.txt     # Emit the last line of a file     sed '$!d' file.txt     # Emit all lines greater than 30 characters in length     sed -n '/^.\{30\}/p' file.txt     # Emit all non-blank lines     sed '/^$/d' file.txt     # Remove all blank lines at the top of a file     sed '/./,$!d' file.txt