Comments on: Basic Shell Scripting

By: Chaos

Chaos — Tue, 24 Mar 2009 17:05:06 +0000

“the file to make it executable file
command is as follows
chmod 777 firstscript.sh” = RWX-Globally
As others have said this is a very poor practice. Most Linux users that use these tutorials are new and that statement is false. There are better and MUCH safer ways to make a file executable: chmod +x in CLI, or in GUI environment, right click the file select properties, place a tick mark in “Make file Executable”. Now the script file is executable, and you do not have to worry about other users making changes to it.

By: kanz

kanz — Wed, 01 Oct 2008 14:49:56 +0000

just a correction: chmod 755 firstscript.sh” or “chmod +x firstscript.sh” will add execute permissions without making the file world writable(not readable as mentioned above).

By: Kunal Gautam

Kunal Gautam — Sun, 01 Jun 2008 17:01:23 +0000

@Quiz Master Best Wishes and rox in examination

By: Quiz_Master

Quiz_Master — Sun, 01 Jun 2008 16:25:13 +0000

Thanks 4 this.. Shell Scripting Paper (BCA 4th Sem)tomorrow.. Need to learn it overnight.!

By: Kunal Gautam

Kunal Gautam — Sun, 01 Jun 2008 16:08:02 +0000

@sathya & Bleu Scrinodeth Thanks a ton
Agreed we dont need to provide any Extension to files But still for better recognistion of files I’ve placed .sh extension
CHMOD all to 777 will make it globally read.write&executables for all users and groups [ if script is used on multiuser platform ]
yes “sh” command is required to run sh and bash shell script. To run c shell script simply supply “csh filename”

By: Sathya

Sathya — Sun, 01 Jun 2008 15:54:29 +0000

Nice tut. You dont need the .sh extension, unlike Windows, *nix dont need file extensions to disnguish filetypes.

The first line, is called the HashBang or She-Bang
PS: Tutorials spelling is wrong, and delete the ps part after correcting.
Cheers.

By: Bleu Scrinodeth

Bleu Scrinodeth — Sun, 01 Jun 2008 15:52:25 +0000

There are several errors in this post.

First problem is that the commands will print to the screen and immediately be cleared. Not a big deal, but hardly a great example for new scripters.

The second is in Method 1. If you run your script with sh, which is symlinked to bash, then ksh and csh scripts will fail. Again, not a big deal for running external commands, but will cause failures when you try to run commands specific to a shell.

The third is in Method 2. To make a file executable there is no need to make it world writable. This is a grievous error to introduce to new scripters. “chmod 755 firstscript.sh” or “chmod +x firstscript.sh” will add execute permissions without making the file world readable.