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The while loop repeats commands. A while loop begins with the keyword while and is followed by a Linux command. The keyword do follows on the next line. The end of the loop is specified by the keyword done. Here is the syntax for the while command:
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The Linux command used in while structures is often a test command indicated by enclosing brackets. In the myname script, in the next example, you are asked to enter a name. The name is then printed out. The loop is controlled by testing the value of the variable again using the bracket form of the test command. myname
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again=yes while [ "$again" = yes ] do echo -n "Please enter a name: " read name echo "The name you entered is $name" echo -n "Do you wish to continue " read again done echo Good-bye
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Here is a run of the myname script:
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$ myname Please enter a name: George The name you entered is George Do you wish to continue yes Please enter a name: Robert The name you entered is Robert Do you wish to continue no Good-bye
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The for-in structure is designed to reference a list of values sequentially. It takes two operands a variable and a list of values. The values in the list are assigned one by one to the variable in the for-in structure. Like the while command, the for-in structure is a loop. Each time through the loop, the next value in the list is assigned to the variable. When the end of the list is reached, the loop stops. Like the while loop, the body of a for-in loop begins with the keyword do and ends with the keyword done. The syntax for the for-in loop is shown here:
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In the mylistfor script, the user simply outputs a list of each item with today's date. The list of items makes up the list of values read by the for-in loop. Each item is consecutively assigned to the grocery variable. mylistfor
tdate=`date +%D` for grocery in milk cookies apples cheese do echo "$grocery $tdate" done
A run of the mylistfor script follows:
$ mylistfor milk 10/23/00 cookies 10/23/00 apples 10/23/00 cheese 10/23/00 $
The for-in loop is handy for managing files. You can use special characters to generate filenames for use as a list of values in the for-in loop. For example, the * special character, by itself, generates a list of all files and directories, and *.c lists files with the .c extension. The special character * placed in the for-in loop's value list will generate a list of values consisting of all the filenames in your current directory.
for myfiles in * do
The cbackup script makes a backup of each file and places it in a directory called sourcebak. Notice the use of the * special character to generate a list of all filenames with a .c extension. cbackup
for backfile in *.c do cp $backfile sourcebak/$backfile echo $backfile done
A run of the cbackup script follows:
$ cbackup io.c lib.c
main.c $
The for structure without a specified list of values takes as its list of values the command line arguments. The arguments specified on the command line when the shell file is invoked become a list of values referenced by the for command. The variable used in the for command is set automatically to each argument value in sequence. The first time through the loop, the variable is set to the value of the first argument. The second time, it is set to the value of the second argument. The for structure without a specified list is equivalent to the list $@. $@ is a special argument variable whose value is the list of command line arguments. In the next example, a list of C program files is entered on the command line when the shell file cbackuparg is invoked. In cbackuparg, each argument is automatically referenced by a for loop, and backfile is the variable used in the for loop. The first time through the loop, $backfile holds the value of the first argument, $1. The second time through, it holds the value of the second argument, $2. cbackuparg
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