How to make a non interactive shell scripts [duplicate] - linux

Question

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Shell script argument parsing
(1 answer)
Closed 8 years ago.
I want to make a non-interactive shell script,where I can give options at the beginning of the execution of the script.
Where I can hard-code the various actions to be taken when different inputs are provided by user.
for example:
Below should perform some action on target.txt
user#/root>myPlannedScript -p targer.txt
Below should perform some other actions on the target.txt
user#/root>myPlannedScript -a targer.txt
For example:
cat tool performs various actions when different options are given. I want my script to act like this:
:/root> cat --h
Usage: cat [OPTION] [FILE]...
Concatenate FILE(s), or standard input, to standard output.
-A, --show-all equivalent to -vET
-b, --number-nonblank number nonblank output lines
-e equivalent to -vE
-E, --show-ends display $ at end of each line
-n, --number number all output lines
-r, --reversible use \ to make the output reversible, implies -v
-s, --squeeze-blank never more than one single blank line
-t equivalent to -vT
-T, --show-tabs display TAB characters as ^I

Answer 1

query.sh
#!/bin/bash
if [ $# -eq 0 ]
then echo do one thing
else echo do other thing
fi
"query.sh" => do one thing
"query.sh anythingYouPut" => do other thing ;oP
but if you really want a parameter for each action
#!/bin/bash
if [ -z "$1" ]
then
echo do nothing
else
if [ $1 -eq 1 ]
then
echo do one thing
fi
if [ $1 -eq 2 ]
then
echo do other thing
fi
fi
"query.sh" => do nothing
"query.sh 1" => do one thing
"query.sh 2" => do other thing