Create parameters for command Linux shell script

Question

Hello I am trying to create parameters for my shell script but I am having trouble.

lets say for example the file is called test.

When I call ./test -parameter1 input_file.txt I get an error saying 'no such file or directory'.

Here is an example of my code.

#!/bin/sh

if [ "$1" == "parameter" ]
then
    while read line
    do
        #echo "$line"
    done <$1
else
    echo "Not working"
fi

My over all goal of this is to read in a file of numbers line by line which I have working, then to calculate the average values of the rows or by columns. Which is why I am trying to create parameters so the user will have to specify ./test -rows input_file.txt or ./test -columns input_file.txt

It would be clearer if you named your script [ instead of test. (That is an attempt at subtle humor, what I really mean is that you should not name your script test, since that is commonly a shell builtin and keeping that name will only lead to confusion.) — William Pursell
– William Pursell, Commented Mar 31, 2015 at 16:41
I have my script called 'stats', was just using 'test' as a generic example. Thanks for the input though, I just started learning and practicing making Linux shell scripts. — Casey Balza
– Casey Balza, Commented Mar 31, 2015 at 17:10

William Pursell · Accepted Answer · 2015-03-31 16:43:26Z

1

You are using the string -parameter as the input file name. Perhaps you want:

#!/bin/sh

if [ "$1" = "-parameter" ]
then
    while read line
    do
        #echo "$line"
    done <$2   # Use $2 instead of $1 here.  Or use shift
else
    echo "Not working" >&2
fi

answered Mar 31, 2015 at 16:43

William Pursell

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