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The actual history events are saved in a file whose name is held in a special variable called HISTFILE. By default, this file is the .bash_history file. You can change the file in which history events are saved, however, by assigning its name to the HISTFILE variable. In the next example, the value of HISTFILE is displayed. Then a new filename is assigned to it, newhist. History events are then saved in the newhist file.
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$ echo $HISTFILE .bash_history $ HISTFILE="newhist" $ echo $HISTFILE newhist
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You use the alias command to create another name for a command. The alias command operates like a macro that expands to the command it represents. The alias does not literally replace the name of the command; it simply gives another name to that command. An alias command begins with the keyword alias and the new name for the command, followed by an equal sign and the command the alias will reference. Note No spaces can be around the equal sign used in the alias command. In the next example, list becomes another name for the ls command:
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$ alias list=ls $ ls mydata today $ list mydata today $
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You can also use an alias to substitute for a command and its option, but you need to enclose both the command and the option within single quotes. Any command you alias that contains spaces must be enclosed in single quotes. In the next example, the alias lss references the ls command with its -s option, and the alias lsa references the ls command with the -F option. ls with the -s option lists files and their sizes in blocks, and the ls with the -F option places a slash after directory names. Notice single quotes enclose the command and its option.
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$ alias lss='ls -s' $ lss mydata 14 today 6 $ alias lsa='ls -F' $ lsa mydata today reports/
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You may often use an alias to include a command name with an argument. If you execute a command that has an argument with a complex combination of special characters on a regular basis, you may want to alias it. For example, suppose you often list just your source code and object code files-those files ending in either a .c or .o. You would need to use as an argument for ls a combination of special characters such as *.[co]. Instead, you could alias ls with the *.[co] argument, giving it a simple name. In the next example, the user creates an alias called lsc for the command ls*.[co]:
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$ alias lsc='ls *.[co]' $ lsc main.c main.o lib.c lib.o
You can also use the name of a command as an alias. This can be helpful in cases where you should only use a command with a specific option. In the case of the rm, cp, and mv commands, the -i option should always be used to ensure an existing file is not overwritten. Instead of constantly being careful to use the -i option each time you use one of these commands, the command name can be aliased to include the option. In the next example, the rm, cp, and mv commands have been aliased to include the -i option:
$ alias rm='rm -i' $ alias mv='mv -i' $ alias cp='cp -i'
The alias command by itself provides a list of all aliases that have been defined, showing the commands they represent. You can remove an alias by using the unalias command. In the next example, the user lists the current aliases and then removes the lsa alias:
$ alias lsa=ls -F list=ls rm=rm -i $ unalias lsa
Controlling Shell Operations
The BASH shell has several features that enable you to control the way different shell operations work. For example, setting the noclobber feature prevents redirection from overwriting files. You can turn these features on and off like a toggle, using the set command. The set command takes two arguments: an option specifying on or off and the name of the feature. To set a feature on, you use the -o option, and to set it off, you use the +o option. Here is the basic form:
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