Tips and Tricks

The simplest way of list just directories ls -d */ You can list the directories start with letter b ls -d b*/ Further more list the subdirectories of the directories start with letter b ls -d b*/*/ The outcome will be look like this backup/10-5-2007/ backup/lunatic/ bin/gdc/ backup/ccbe/ backup/wplbe/ backup/full/ bin/ffmpeg-0.4.9-p20051216/ Bare in mind the command lines above do not list out the hidden directories, to list hidden directories ls -d .*/ Yes, you can also list with details, and with nice colors. ls -d .*/ -l

$ wc file1.txt 211 507 4398 This line means that the file had 211 lines, 507 words and 4398 characters (bytes). Count the number of lines in file1.txt $ wc -l < file1.txt 211 Count the number of words in file2.txt $ wc -w file2.txt 507 file2.txt