Crash Course
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Introduction
GNU_Tools
Example1
Example2
Execution_bit
Bang_bin_bash
Example3
The_dot
Example4
Example5
Example6
Example7
Example8
Background
Forking
Example9
Bash_profile
Pattern_match
Regex
Debug
Gory_details
References
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In order to run a script in Unix you need to set the execution bit:
Say I just created the talk.sh script shown in Example 2.
[email protected]> emacs talk.sh [email protected]>Note on Unix Text Editors: You can choose from vi, emacs, pico, or joe to name some of the common ones. This is one of every Unix newbie's great hurdle -- learning a new Text Editor.
[email protected]> ls -l talk.sh -rw-rw-r-- 1 dlink viddev 5 2006-07-20 13:10 talk.txt
Now to set the execution bit:
[email protected]> chmod a+x talk.sh [email protected]> ls -l talk.sh -rwxrwxr-x 1 dlink viddev 5 2006-07-20 13:10 talk.sh
Meaning of the three x's:
- Executable for the owner (that's me),
- Executable for any user in my group: viddev, and
- Executable for all other, respectively.
Another way to set the execution bits, (which is cooler because it uses binary) is this:
[email protected]> chmod 775 talk.sh [email protected]> ls -l talk.sh -rwxrwxr-x 1 dlink viddev 5 2006-07-20 13:10 talk.sh
Finally we're good to go:
[email protected]> ./talk.sh Hello dlink, Today is Thursday Today's date is 20-Jul-2006 And the time is 11:51:59 AM
But what if I don't want to set the Execution bit?
Fine, you would get this:
[email protected]> ./talk.sh -bash: ./talk.sh: Permission denied
