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tar command examples

Create a new tar archive.

tar cvf archive_name.tar dirname/

Extract from an existing tar archive.

tar xvf archive_name.tar

View an existing tar archive.

tar tvf archive_name.tar

grep command examples

Search for a given string in a file (case in-sensitive search).

grep -i "the" demo_file

Print the matched line, along with the 3 lines after it.

grep -A 3 -i "example" demo_text

Search for a given string in all files recursively

grep -r "ramesh" *

find command examples

Find files using file-name ( case in-sensitve find)

find -iname "MyCProgram.c"

Execute commands on files found by the find command

find -iname "MyCProgram.c" -exec md5sum {} \;

Find all empty files in home directory

find ~ -empty

ssh command examples

ssh -l jsmith remotehost.example.com

Debug ssh client

ssh -v -l jsmith remotehost.example.com

Display ssh client version

ssh -V

OpenSSH_3.9p1, OpenSSL 0.9.7a Feb 19 2003

sed command examples

When you copy a DOS file to Unix, you could find \r\n in the end of each line. This example converts the DOS file format to Unix file format using sed command.

sed 's/.//' filename

Print file content in reverse order

sed -n '1!G;h;p' thegeekstuff.txt

Add line number for all non-empty-lines in a file

sed '/./=' thegeekstuff.txt | sed 'N; s/\n/ /'

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