File – Marius van Witzenburg

How to read a file line by line with Bash

By mariusvw

July 10, 2011

Sometimes you want to do actions per line instead of the complete file at once. Here is an example that you can use to read the file line by line.

#!/bin/bash
run_cmd_file() {
    while read line
    do
        chr=${line:0:1}
        case $chr in
            "#" )  # ignore commented lines
                ;;
            *   )
                echo "$line"
                ;;
        esac
    done &lt; $1
}

run_cmd_file filename

#!/bin/bash

run_cmd_file() {

while read line

chr=${line:0:1}

case $chr in

"#" ) # ignore commented lines

;;

* )

echo "$line"

;;

esac

done < $1

}

run_cmd_file filename

How to get a file extension with PHP

By mariusvw

January 4, 2010

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| How to

The following script makes it more easy to get the file extension from a file name:

function get_file_extension($str) {
    $i = strrpos($str,".");
    if (!$i) { return ""; }
    $l = strlen($str) - $i;
    $ext = substr($str,$i+1,$l);
    return $ext;
}
echo get_file_extension('myfile.txt');

function get_file_extension($str) {

$i = strrpos($str,".");

if (!$i) { return ""; }

$l = strlen($str) - $i;

$ext = substr($str,$i+1,$l);

return $ext;

}

echo get_file_extension('myfile.txt');

In case you have the ability to use mime type detection, you could combine it with the above function to validate if the extension is valid for the content of the file.