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Full Discussion: Capturing time stamp in file name
Top Forums Shell Programming and Scripting Capturing time stamp in file name Post 302964171 by bakunin on Monday 11th of January 2016 04:57:32 PM
Old 01-11-2016
Quote:
Originally Posted by ldorsey
I feel like I should use some sort of regex, but I don't want to force the shell script to look through the entire directory for that file. Is there a way to do this?
In any way the shell will have to look through the directory anyway, because file regexes ("globs" in shell speak) are expanded by the shell - always. If you write a command like ls -l foo* The shell will first expand foo* to a list of files matching this expression, let us say fooA fooB fooC, and then feed this to the ls command. Entering the command ls -l fooA fooB fooC would have had the same effect.

Therefore: either you know exactly what your file is named beforehand or you will have to use a glob (like "*", "?", etc.). On the up side it doesn't take much time to search through a directory at all, because UNIX kernels are in the habit of putting every ounce of spare memory to disk caching. Because metadata (inodes, directories, the supernode and so on) are used very often (compared to the content of most files) chances are the needed data are already in memory and are found pretty quickly.

I hope this helps.

bakunin
 

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LEARN ABOUT OPENDARWIN

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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