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This is mainly for the Linux / *nix type developers. This will show you a small example of how to change the values of something in multiple files, without having to open each ove of them up in an editor and doing it by hand. example: 2 files: a.php3 b.php3 Contents a.php3: ---- Hello World ---- b.php3: ---- GoodBye World ---- in that same directory type (Each on a new line ): for i in *.php3 ; do sed s^World^Planet^g < $i > $i.new mv $i.new $i done Now read the files... they should read Hello Planet and Goodbye Planet For a break down of those commands: 1 for i in *.php3 ; do 2 sed s^World^Planet^g < $i > $i.new 3 mv $i.new $i 4 done Line 1: sets up a loop that will execute the following functions until the construct no longer exists. i is the counter, and *.php3 signifies that only files that end in .php3 will be effected. ; do actually starts the loop Line 2: sed (Stream EDitor), This command takes the target files, and reads them line by line... and changes the lines if they match the pattern. syntax: sed s^Target_String^Replacement_String^g < $i > $i.new sed s = search and replace Target_String = The string sed looks for Replacement_String = The string that is put in place of the Target String g = Globally. This means that if Hello Hello is on one line BOTH will be changed, if no g is added, only the first instance will be changed. < $i = Takes the contents of the current file ($i) -- (Which is whatever *.php3 file is currently in the loop), and dumps it into set. (ex: x.php3) > $i.new = Takes the RESULT of the sed command and dumps it into (current_file.new) (ex: x.php3.new) Line 3: moves x.php3.new to x.php3 (writes the changes to the old file) Line 4: ends the script. This script has helped me incredibly time and time again, it has saved me hours of coding, by manipulating large groups of files without me ever having to open them up and editing them. For more information on sed check out man sed on your linux box Tim | |||||
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