Shell Script

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A shell script is a computer program designed to be run by the Unix shell, a command-line interpreter. The various dialects of shell scripts are considered to be scripting languages. Typical operations performed by shell scripts include file manipulation, program execution, and printing text.

Shell Script is series of command written in plain text file. Shell script is just like batch file is MS-DOS but have more power than the MS-DOS batch file.

• Shell script can take input from user, file and output them on screen.
• Useful to create our own commands.
• Save lots of time.
• To automate some task of day today life.
• System Administration part can be also automated.

Shell Script Arguments

#!/bin/bash # example of using arguments to a script echo "My first name is $1" echo "My surname is $2" echo "Total number of arguments is $#"

Save this file as name.sh, set execute permission on that file by typing chmod a+x name.sh and then execute the file like this: ./name.sh.

$ chmod a+x name.sh $ ./name.sh Hans-Wolfgang Loidl My first name is Hans-Wolfgang My surname is Loidl Total number of arguments is 2