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Top Forums Shell Programming and Scripting Understanding Logic and Flow better Post 302330368 by kshji on Wednesday 1st of July 2009 04:00:08 AM
Old 07-01-2009
I'm sure there are pages which include helps for you.

I have done something, but language is mostly finnish.
Karjalan ATK-Awot Oy
Ofcourse you can look those pages using Googles translator
Google Kääntäjä


if command I have done page using my english. Why ? If has used so often like programlanguage if. If command is different. Same situation with ex. case.
Karjalan ATK-Awot Oy

Big idea is to understand that everyline is commandline = works same way even command is builtin if, case, ... or something else like date, ls, rm, ...
- filename generation
- pipe
- io-redirection
- argument delimeter !!! (ex. if ...)
- ...

Example
Code:
ls * 
echo *
if cp x y 2>/dev/null ; then
   print ok
else
   print not so good
fi

I'm sure, you get other links also.
 

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CHSH(1)                                                            User Commands                                                           CHSH(1)

NAME
chsh - change login shell SYNOPSIS
chsh [options] [LOGIN] DESCRIPTION
The chsh command changes the user login shell. This determines the name of the user's initial login command. A normal user may only change the login shell for her own account; the superuser may change the login shell for any account. OPTIONS
The options which apply to the chsh command are: -h, --help Display help message and exit. -R, --root CHROOT_DIR Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory. -s, --shell SHELL The name of the user's new login shell. Setting this field to blank causes the system to select the default login shell. If the -s option is not selected, chsh operates in an interactive fashion, prompting the user with the current login shell. Enter the new value to change the shell, or leave the line blank to use the current one. The current shell is displayed between a pair of [ ] marks. NOTE
The only restriction placed on the login shell is that the command name must be listed in /etc/shells, unless the invoker is the superuser, and then any value may be added. An account with a restricted login shell may not change her login shell. For this reason, placing /bin/rsh in /etc/shells is discouraged since accidentally changing to a restricted shell would prevent the user from ever changing her login shell back to its original value. FILES
/etc/passwd User account information. /etc/shells List of valid login shells. /etc/login.defs Shadow password suite configuration. SEE ALSO
chfn(1), login.defs(5), passwd(5). shadow-utils 4.5 01/25/2018 CHSH(1)
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