08-29-2011
Thanks for the code above, but I'm afraid my knowledge of shell script does not extend that far
![Frown Smilie](https://www.unix.com/images/smilies/frown.gif)
...I do not know how to use the while command or done. I'm vaguely familiar with shift as well...
When I inputted:
PHP Code:
~/test/subst2 cat cow happy.txt
Even though there was no string "cat" in the file "happy.txt", it still created a .bak file...I am trying to make it so that if there is no string in the file that I am looking for to replace, then nothing will happen to the file.
Also there was a mistake in my code, the actual code in my "subst2" file is this:
PHP Code:
#!/bin/sh
if [ -z "$3" ] ; then
echo expect string1, string2, file
exit 1
fi
if [ -f "$3" ] ; then
mv "$3" "$3.bak"
sed "s/$1/$2/g" "$3.bak" > "$3"
else
echo $3 not found
exit 1
fi
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EXIT(3) 1 EXIT(3)
exit - Output a message and terminate the current script
SYNOPSIS
void exit ([string $status])
DESCRIPTION
void exit (int $status)
Terminates execution of the script. Shutdown functions and object destructors will always be executed even if exit is called.
exit is a language construct and it can be called without parentheses if no $status is passed.
PARAMETERS
o $status
- If $status is a string, this function prints the $status just before exiting. If $status is an integer, that value will be used
as the exit status and not printed. Exit statuses should be in the range 0 to 254, the exit status 255 is reserved by PHP and
shall not be used. The status 0 is used to terminate the program successfully.
Note
PHP >= 4.2.0 does NOT print the $status if it is an integer.
RETURN VALUES
No value is returned.
EXAMPLES
Example #1
exit example
<?php
$filename = '/path/to/data-file';
$file = fopen($filename, 'r')
or exit("unable to open file ($filename)");
?>
Example #2
exit status example
<?php
//exit program normally
exit;
exit();
exit(0);
//exit with an error code
exit(1);
exit(0376); //octal
?>
Example #3
Shutdown functions and destructors run regardless
<?php
class Foo
{
public function __destruct()
{
echo 'Destruct: ' . __METHOD__ . '()' . PHP_EOL;
}
}
function shutdown()
{
echo 'Shutdown: ' . __FUNCTION__ . '()' . PHP_EOL;
}
$foo = new Foo();
register_shutdown_function('shutdown');
exit();
echo 'This will not be output.';
?>
The above example will output:
Shutdown: shutdown()
Destruct: Foo::__destruct()
NOTES
Note
Because this is a language construct and not a function, it cannot be called using variable functions.
Note
This language construct is equivalent to die(3).
SEE ALSO
register_shutdown_function(3).
PHP Documentation Group EXIT(3)