[root@alanstudio]# awk '{print $3}'

awk - print out the thrid column context

[root@alanstudio]# cat /var/log/maillog | grep alan

show the context and print lines matching with word "alan"

[root@alanstudio]# cut -d ':' -f1,2

show the file context that remove sections with letter ":" from each line
of files, and show only column 1 and 2 (count in forward with :)
eg: echo "ab:cd:ef:gh:ij:" | cut -d ':' -f2,4
output: cd:gh

[root@alanstudio]# diff file1 file2

compare with two files

[root@alanstudio]# du -sh ./*

show summary of files/folder size in current directory

[root@alanstudio]# du -h > list.txt

show each files/folder size in current directory and write in list.txt

[root@alanstudio]# file xyz.dat

dtermine the file type

[root@alanstudio]# find /home -name 'index.htm'

Find all path of file in /home

[root@alanstudio]# find /home -name '*index*'

Find all path of any file related to "index" in /home

[root@alanstudio]# grep -ir "word" *

Show the lines include "word" within all files in current directory

[root@alanstudio]# grep -v word file1

Show the lines exclude word in file1

[root@alanstudio]# ll -tr

List the files/folders in line with date sorting

[root@alanstudio]# locate index.htm

Locate all path of file
If out of database, use command updatedb

[root@alanstudio]# ls -a
[root@alanstudio]# ls -lah

List the files/folder in current directory
-l (line list) -a (all files) -h (show size for human)

[root@alanstudio]# sort index.htm

sort lines of text files
-n (numeric sort) -r (reverse)

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Linux Operating System

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