Shell script之How to write

Write shell script:

　1)　　Editor like vi or mcedi

　2)　　Set execute permission for your script

　　　　　chmod  permission  your-script-name

$ chmod +x your-script-name
$ chmod 755 your-script-name

　　This will set read write execute(7) permission for owner, for group and other permission is read and execute only(5).

　

　3)　　　Execute script

　　　　　　bash your-script-name
　　　　　　sh your-script-name
　　　　　　./your-script-name

　　In the last syntax ./ means current directory, But only . (dot) means execute given command file in current shell without starting the new copy of shell.

$ . foo

　　4)　　Practice

 $ vi first
 #
 # My first shell script
 #
 clear
 echo "Knowledge is Power"

 $ vi ginfo
 2 #
 3 #
 4 # Script to print user information who currently login , current date & time
 5 #
 clear
 echo "Hello $USER"
 echo "Today is \c ";date
 echo "Number of user login : \c" ; who | wc -l
 echo "Calendar"
 cal
 exit 0

　

　5)　Feng - quickly go to specific directory by shell scripts

 1 #!/bin/bash
 2 # ----------------------------------------------------------------------------
 3 # quickly go to software development directory
 4 # ----------------------------------------------------------------------------
 
 if [ $# -eq  ]; then
     cd '01_Project/02_Projrct_Name/02_DIGITAL/01_src/software/embedded'
 8     # list all the software development directory
     ls
 fi

then in your Linux terminal enter

# dot(.) can execute command file at current directory
. software.sh