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Pass arguments to bash script

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# 1  
Old 07-14-2013
Pass arguments to bash script
myscript.sh

Code:
#!/bin/bash

ARGA=$1

if [ "${ARGA}" = "jsmith" ] ; then
        echo "${ARGA}:Confirmed"
else
        echo "${ARGA}:Unconfirmed"
fi

when I run the above script from the command line, i run it as:

Code:
./myscript.sh jsmith

now some times, i need to runn it this way:

Code:
sed -n 1,9p myscript.sh | bash

notice, there's no where for me to pass whatever argument i need to pass in this command.

does anyone know of a way around this? i want to be able able to pass the "jsmith" as an argument when using the sed command.

my weak attempts at this were:

Code:
sed -n 1,9p myscript.sh | bash jsmith

and

Code:
sed -n 1,9p myscript.sh | bash $*

# 2  
Old 07-14-2013
Quote:
Originally Posted by SkySmart
myscript.sh

Code:
#!/bin/bash

ARGA=$1

if [ "${ARGA}" = "jsmith" ] ; then
        echo "${ARGA}:Confirmed"
else
        echo "${ARGA}:Unconfirmed"
fi

when I run the above script from the command line, i run it as:

Code:
./myscript.sh jsmith

OK, good.
Quote:
Originally Posted by SkySmart

now some times, i need to runn it this way:

Code:
sed -n 1,9p myscript.sh | bash

notice, there's no where for me to pass whatever argument i need to pass in this command.
Why in the world do you want to do this? The stream editor is not a shell; you aren't changing anything in the script; you are just making it hard to pass an argument to the script and making it EXTREMELY inefficient.
Quote:
Originally Posted by SkySmart
does anyone know of a way around this? i want to be able able to pass the "jsmith" as an argument when using the sed command.

my weak attempts at this were:

Code:
sed -n 1,9p myscript.sh | bash jsmith

and

Code:
sed -n 1,9p myscript.sh | bash $*

You have a working script. You know how to pass parameters to it. What are you trying to do with sed that will be different that what was already working for you without using sed???
# 3  
Old 07-14-2013
Quote:
Originally Posted by Don Cragun
OK, good.Why in the world do you want to do this? The stream editor is not a shell; you aren't changing anything in the script; you are just making it hard to pass an argument to the script and making it EXTREMELY inefficient.
You have a working script. You know how to pass parameters to it. What are you trying to do with sed that will be different that what was already working for you without using sed???
thanks don. i do understand it can be considered as inefficient. but i'm working on something that uses the idea behidn this for a different purpose. i just wanted to know if what i was trying to do is doable. i wouldn't do this with any of my other scripts. just this one in particular
# 4  
Old 07-14-2013
Quote:
Originally Posted by SkySmart
thanks don. i do understand it can be considered as inefficient. but i'm working on something that uses the idea behidn this for a different purpose. i just wanted to know if what i was trying to do is doable. i wouldn't do this with any of my other scripts. just this one in particular
If you explain what "different purpose", there is probably an easy way to do it in the shell script itself.

I repeat: What are you trying to do?
# 5  
Old 07-14-2013
Quote:
Originally Posted by Don Cragun
If you explain what "different purpose", there is probably an easy way to do it in the shell script itself.

I repeat: What are you trying to do?
this is related to this thread:

https://www.unix.com/shell-programmin...writing-2.html

i would like to be able to plug in as many arguments as i want to in replacement of jsmith.
# 6  
Old 07-14-2013
Self modifying code is generally not a good idea. Would you consider something like the following instead?
Code:
#!/bin/bash
IAm=${0##*/}
IAmDone=".$IAm"
ARGA=$1

if [ -f "$IAmDone" ]
then
        date
        exit
fi

if [ "${ARGA}" = "jsmith" ]
then    echo "${ARGA}:Confirmed"
        touch "$IAmDone"
else    echo "${ARGA}:Unconfirmed"
fi

This will work like your script originally worked until it confirms that jsmith was passed in as an argument. Any time it is called after that, it will just print the current date and exit. For example, the following commands:
Code:
./myscript.sh abc;./myscript.sh jsmith;./myscript.sh abc;./myscript.sh jsmith

produces the output:
Code:
abc:Unconfirmed
jsmith:Confirmed
Sun Jul 14 19:53:06 PDT 2013
Sun Jul 14 19:53:06 PDT 2013

Last edited by Don Cragun; 07-14-2013 at 11:59 PM.. Reason: Fix autocorrection induced typo.
This User Gave Thanks to Don Cragun For This Post:
SkySmart
# 7  
Old 07-15-2013
Quote:
Originally Posted by Don Cragun
Self modifying code is generally not a good idea. Would you consider something like the following instead?
Code:
#!/bin/bash
IAm=${0##*/}
IAmDone=".$IAm"
ARGA=$1

if [ -f "$IAmDone" ]
then
        date
        exit
fi

if [ "${ARGA}" = "jsmith" ]
then    echo "${ARGA}:Confirmed"
        touch "$IAmDone"
else    echo "${ARGA}:Unconfirmed"
fi

This will work like your script originally worked until it confirms that jsmith was passed in as an argument. Any time it is called after that, it will just print the current date and exit. For example, the following commands:
Code:
./myscript.sh abc;./myscript.sh jsmith;./myscript.sh abc;./myscript.sh jsmith

produces the output:
Code:
abc:Unconfirmed
jsmith:Confirmed
Sun Jul 14 19:53:06 PDT 2013
Sun Jul 14 19:53:06 PDT 2013

im curious, why isn't a self modifying code a good idea?
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