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Full Discussion: how to declare variable in perl
Top Forums Shell Programming and Scripting how to declare variable in perl Post 302691017 by Corona688 on Thursday 23rd of August 2012 05:44:25 PM
Old 08-23-2012
That's not even how you declare a variable in shell... I think you mean, how do you *-globbing in perl.

Code:
foreach( </sys/block/emcpow*> )
{
        system("blockdev --setra 16384 $_");
}

Just one thing to realize: system() runs a shell exactly like the shell the scripts I already showed you ran in.

So you are not running perl instead of shell. You're running lots and lots of shells, with a tiny topping of pointless perl. (Sorry, it's a peeve of mine.)
Last edited by Corona688; 08-23-2012 at 06:49 PM..
 

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LEARN ABOUT PHP

chsh

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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