Name changing script Post: 302984538

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Top Forums Shell Programming and Scripting Name changing script Post 302984538 by Don Cragun on Wednesday 26th of October 2016 10:39:48 PM

10-26-2016

Registered User

The move command:

Code:

mv old new

moves the file named old to replace (or, if new did not exist, create) the file named new.
The command:

Code:

for file in *.jpg
do	mv "$file" "${file%.jpg}.png"
done

Runs that move command once for every file in the current working directory with a name ending with the string .jpg with the shell variable file set to the name of one of those files. With old being "$file", the name of the old file is the expansion of that variable protected by double quotes to be a single operand even if the old filename contains field separators (such as <space> or <tab>). With new being the parameter expansion ${file%.jpg} which expands the shell variable named file removing the smallest string matched by the filename matching pattern.jpg from the end of the contents of the variable and appends the string .png to the end of that variable expansion, and, again is enclosed in double quotes to protect agains field separators being present in the filename that is being expanded.

If you look at the man page for your shell, you'll find that there are several variable expansion operators in addition to the % operator that was used in the above expansion that can be used to remove the longest trailing pattern match, the shorted leading pattern match, the longest leading pattern match, return the number of characters in the contents of the variable; and with many shell, lots of other operators are also available.

Last edited by rbatte1; 10-27-2016 at 06:15 AM.. Reason: Corrected tags

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LEARN ABOUT DEBIAN

installsieve

INSTALLSIEVE(1) 					      General Commands Manual						   INSTALLSIEVE(1)

 *

NAME

       installsieve - user utility for managing sieve scripts

SYNOPSIS

       installsieve

DESCRIPTION

       installsieve is a utility that allows users to manage their sieve scripts kept on the server.

OPTIONS

       -v <name> View script with the given name. The script if retrieved sucessfully is output to standard output.

       -l  List  all  of  the scripts currently on the server. If one of the scripts is active a arrow is printed indicating that it is the active
       script.

       -p <port> Port to connect to. If left off this defaults to "sieve" as defined in /etc/services.

       -i <file> Install a file onto the server. If a script with the same name already exists on the server it is overwritten.  Upon  sucessfully
       putting	the  script on the server the script is set active. If <file> has the extension .script it is chopped when put on the server since
       sieve names may not contain a '.'.

       -a <name> Set <name> as the active script. The list of available names can be obtained from the '-l' option..

       -d <name> Delete the sieve script on the server with <name>.

       -m <mechanism> Force installsieve to use <mechanism> for authentication. If not specified the strongest authentication mechanism is chosen.

       -g <name> Get the sieve script with <name> and save it to disk with a ".script" extension. If a file with that name already  exists  it	is
       overwritten.

       -u <user> Userid/Authname to use for authentication; by default, the current user.

CMU
								   Project Cyrus						   INSTALLSIEVE(1)

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