Running php via a unix script

Question

I have the above shell script .

#!/bin/bash

# a shell script that keeps looping until an exit code is given

nice php -q -f ./data.php -- $@
ERR=$?

exec $0 $@

I have a few doubts

What is $0 and what is $@
what is ERR=$?
what does -- $@ in 5th line do
I wanted to know if can i pass data.php as a parameter. so that i have only i shell script for all kind of execution . Say, i want to run "sh ss.sh data1.php" then this should run data1.php, if run "ss ss.sh data2.php" it should run data2.php –

$@ the arguments $0 the first argument ERR is the return value from the execution — Osama Javed
– Osama Javed, Commented May 2, 2012 at 14:12
-- $@ passes all the arguments to php linux.die.net/man/1/php — Osama Javed
– Osama Javed, Commented May 2, 2012 at 14:19
now I understand your 4th question .. try something like "`php $1 -- $@`` — Osama Javed
– Osama Javed, Commented May 2, 2012 at 14:21

dwalter · Accepted Answer · 2012-05-02 14:22:12Z

1

1) $0 is the name of the executable (the script in your case, eg: if your script is called start_me then $0 is start_me)

2) ERR=$? gets the return code of nice php -q -f ./data.php -- $@

3) -- $@ does two things, first of all it tell the php command that all following parameter shall be passed to data.php and $@ passes all given parameter to the script to ./data.php (eg. ./your_script_name foo bar will translate to nice php -q -f ./data.php -- foo bar)

4) short answer yes, but you have to change the script to

 YOUR_FILE=$1
 shift #this removes the first argument from $@
 nice php -q -f ./$YOUR_FILE -- $@

edited May 2, 2012 at 14:22

answered May 2, 2012 at 14:16

dwalter

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Comments

Tikkes · Accepted Answer · 2012-05-02 14:22:29Z

0

$0

is the name of the script.

$@

are the arguments given to the script

ERR=$?

catches the status code of the previous command

php_command="php -q -f $1"
shift
nice $php_command -- $@

You take the first parameter for the f-flag, then you shift it off the parameter list and pass the rest after the double dashes.

edited May 2, 2012 at 14:22

answered May 2, 2012 at 14:13

Tikkes

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3 Comments

aWebDeveloper Over a year ago

i want to run "sh ss.sh data.php" . this run run data.php i if run "ss ss.sh data2.php" it should run data2.php

aWebDeveloper Over a year ago

will the last line holds true in your case i.e exec $0 $@

Tikkes Over a year ago

You should not call the exec-function because it will execute your program a second time. This could cause a recursive loop.

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