CODEWITHSUNDEEP
linuxbashscripting
vooD
vooD

Reputation: 2921

How do I prepend a string to each file in directory that matches my pattern?

I'm trying to prepend require_once 'bootstrap.php'; string to each schema.yml file in specific dirrectory. I'm linux newbie. Could someone show me the one-line-magic-command?

Any help is very appreciated!

EDIT I need to search for schema.yml recursively.

Upvotes: 2

Views: 1750

Answers (5)

Matt
Matt

Reputation: 1244

Create a quick python script:

prepend_my_text.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import sys
import os
from os.path import join

TEXT = """require_once 'bootstrap.php';\n"""

def main():
    for dirpath, _, files in os.walk("."):
        for f in files:
            if f == "schema.yml":
                with file(join(dirpath, f), 'r') as original: data = original.read()
                with file(join(dirpath, f), 'w') as modified: modified.write(TEXT + data)

if __name__ == '__main__':
    main()

and run it in the directory you are searching: $ chmod +x prepend.py $ ./prepend.py

The nice thing is that you can use string literals (triple quotes in python) to avoid worrying about escaping characters

Upvotes: 0

Kelan
Kelan

Reputation: 2276

This is a followup to @dogbane 's answer, which I liked, but needed some tweaking to work properly on my Mac. (I tried to post this as a comment on his answer, but I don't think you can put all this formatting in a comment.)

I ended up with:

find somedir -name schema.yml | xargs sed -i '' "1i\\
require_once 'bootstrap.php';
"

Specifically, the changes were:

  1. The -i option to sed (the extension to use for the backup file for in-place editing) requires an argument, but empty quotes are sufficient (which tells it not to create a backup file).
  2. The sed command needed to have a \ after the address (but escaped, because it's in double-quotes, so it ends up as a \\), then a newline, then the text to add, then another newline, then the close quote.

Upvotes: 1

dogbane
dogbane

Reputation: 274758

Using sed:

find somedir -name schema.yml | xargs sed -i "1i require_once 'bootstrap.php';"

Upvotes: 6

tchrist
tchrist

Reputation: 80433

find somedir -name schema.yml | \
   xargs perl -i.orig -pe 'print "require_once \x27bootstrap.yml\x27\n" if $. == 1; close ARGV if eof'

Upvotes: 4

Thomas
Thomas

Reputation: 724

You may want to review your spelling of "bootrstap.yml"...

#!/bin/bash
TMPFILE=/tmp/reallyuniquetempnamewhateveryouchoose
for f in `find . -name schema.yml`
do
    echo "require_once 'bootrstap.yml';" > $TMPFILE
    cat $f >> $TMPFILE
    mv -v $TMPFILE $f
done

Edit: well the one-liner above is better, even if it's a bit harder to understand at first :)

Upvotes: 2

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