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.

Example:

$ . foo

　　4)　　Practice

1 $ vi first
2 #
3 # My first shell script
4 #
5 clear
6 echo "Knowledge is Power"

 1 $ vi ginfo
 2 #
 3 #
 4 # Script to print user information who currently login , current date & time
 5 #
 6 clear
 7 echo "Hello $USER"
 8 echo "Today is \c ";date
 9 echo "Number of user login : \c" ; who | wc -l
10 echo "Calendar"
11 cal
12 exit 0

Shell script之How to write

原文：http://www.cnblogs.com/mengdie/p/4637081.html