Linux delete the specified line & delete the beginning space & Replace character

Print and delete 2~1000 lines

nl/etc/passwd | Sed ' 2,1000d ' |more

Delete Line Start space

Sed ' s/^[][]*//g ' file

Replace delimiter

Note: The data in the file is separated by one or tab stops (multiple spaces), and the spaces are replaced with specific characters. Workaround: Sed-e ' s/[] []*/,/g ' filenameor: sed-e ' s/[[:space:]][[:space:]]*//g ' filenameThis replaces the space or tab stop with a "comma".

Linux delete the specified line & delete the beginning space & Replace character