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You use the alias command to create another name for a command The alias operates like a macro that expands to the command it represents The alias does not literally replace the name of the command; it simply gives another name to that command An alias command begins with the keyword alias and the new name for the command, followed by the command that the alias will reference In the next example, the ls command is aliased with the name list list becomes another name for the ls command
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> alias list ls > ls mydata intro > list mydata intro >
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Should the command you are aliasing have options, you will need to enclose the command and the option within single quotes An aliased command that has spaces will need quotation marks as well In the next example, ls with the -l option is given the alias
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> alias longl 'ls -l' > ls -l -rw-r--r-- 1 chris weather 207 Feb > longl -rw-r--r-- 1 chris weather 207 Feb >
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You can also use the name of a command as an alias In the case of the rm, cp, and mv commands, the -i option should always be used to ensure that an existing file is not overwritten Instead of always being careful to use the -i option each time you use one of
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Part II:
The Linux Shell and File Structure
these commands, you can alias the command name to include the option In the next examples, the rm, cp, and mv commands have been aliased to include the -i option
> alias rm 'rm -i' > alias mv 'mv -i' > alias cp 'cm -i'
The alias command by itself provides a list of all aliases in effect and their commands An alias can be removed with the unalias command
> alias lss ls -s list ls rm rm -i > unalias lss
TCSH/C Shell Feature Variables: Shell Features
The TCSH shell has several features that allow you to control how different shell operations work The TCSH shell s features include those in the PDSKH shell as well as many of its own For example, the TCSH shell has a noclobber option to prevent redirection from overwriting files Some of the more commonly used features are echo, noclobber, ignoreeof, and noglob The TCSH shell features are turned on and off by defining and undefining a variable associated with that feature A variable is named for each feature, for example, the noclobber feature is turned on by defining the noclobber variable You use the set command to define a variable and the unset command to undefine a variable To turn on the noclobber feature you issue the command set noclobber To turn it off you use the command unset noclobber
> set feature-variable > unset feature-variable
These variables are also sometimes referred to as toggles since they are used to turn features on and off
echo
Setting echo enables a feature that displays a command before it is executed The command set echo turns the echo feature on, and the command unset echo turns it off
ignoreeof
Setting ignoreeof enables a feature that prevents users from logging out of the user shell with a CTRL-D It is designed to prevent accidental logouts With this feature turned off, you can log out by pressing CTRL-D However, CTRL-D is also used to end user input entered directly into the standard input It is used often for the Mail program or for utilities such as cat You can easily enter an extra CTRL-D in such circumstances and accidentally log yourself out The ignoreeof feature prevents such accidental logouts When it is set, you have to explicitly log out, using the logout command:
$ set ignoreeof $ ^D Use logout to logout $
5:
Shell Configuration
noclobber
Setting noclobber enables a feature that safeguards existing files from redirected output With the noclobber feature, if you redirect output to a file that already exists, the file will not be overwritten with the standard output The original file will be preserved There may be situations in which you use a name that you have already given to an existing file as the name for the file to hold the redirected output The noclobber feature prevents you from accidentally overwriting your original file:
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