11-22-2011
can someone explain shift command in script?
think using shift would help me finish my script but cant get it work without your help. would appreciate if you give me a example with shift & counter in the same script so I can later work on that to my one.
Thanks and Good Luck!
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getopt(1) General Commands Manual getopt(1)
NAME
getopt - Parses command line flags and arguments
SYNOPSIS
getopt format tokens
DESCRIPTION
The getopt command is used to parse a list of tokens using a format that specifies expected flags and arguments. A flag is a single ASCII
letter and, when followed by a : (colon), is expected to take a modifying argument that may or may not be separated from it by one or more
tabs or spaces. (You can include multi-byte characters in arguments, but not as flag letters.)
The getopt command completes processing when it has read all tokens or when it encounters the special token -- (double dash). It then out-
puts the processed flags, a --, and any remaining tokens.
If a token fails to match a flag, getopt writes a message to standard error.
NOTES
In the csh, use the following command to run getopt:
set argv=`getopt flag_string $*`
EXAMPLES
The following is an example of the use of getopt in a skeleton shell script to parse options:
#!/bin/sh # parse command line into arguments set -- `getopt a:bc $*` # check result of parsing if [ $? != 0 ] then
exit 1 fi while [ $1 != -- ] do
case $1 in
-a) # set up the -a flag
AFLG=1
AARG=$2
shift;;
-b) # set up the -b flag
BFLG=1;;
-c) # set up the -c flag
CFLG=1;;
esac
shift # next flag done shift # skip double dash # now do the work . . .
The following are all equivalent arguments to the script:
-a ARG -b -c -- A B C -a ARG -bc -- A B C -aARG -b -c -- A B C -b -c -a ARG -- A B C
SEE ALSO
Commands: sh(1)
Functions: getopt(3)
getopt(1)