Bash Resize Pictures (directory & subdirectories)

[jmadero]

Hi All,

Want to make a script that will resize pictures within the directory and all sub directories. I know it's pretty straight forward, to do within the directory itself it's just this:

#!/bin/bash
for i in `ls *.jpg`;
do
convert $i -resize 800×600 $i
done


Thanks all

**batch, not bash

[Cabhan]

So you basically want to make this recursive. You could do something like this:

#!/bin/bash

if [ -z "$1" ]; then
    # No directory given; start with .
    dir=.
else
    dir=$1
fi

for file in "$dir/*"; do
    if [ -d "$file" ]; then
        # This is a directory
        "$0" "$file"
    elif echo "$file" | egrep -q '.*\.jpe?g$'; then
        # This is a JPEG file
        convert "$file" -resize 800x600 "$file"
    fi
done

I haven't actually run this, but it should give you a basic idea.

[drl]

Hi.

The utility find can discriminate between directories and plain files, and produces the pathname, so I would use that in the operating command. Here is a script that displays my running context and shows this way of doing something to each jpg file in a tree:

#!/usr/bin/env bash

# @(#) s1	Demonstrate process tree of files.

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
# export PATH="/usr/local/bin:/usr/bin:/bin"
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && $C find

DIR=${1-d1}

pl " Input directory $DIR:"
tree $DIR

pl " Results:"
find $DIR -type f -name '*.jpg' |
while read i
do
  pe " Would have run \"convert $i -resize 800x600 $i\""
done

exit 0

producing:

% ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0.8 (lenny) 
GNU bash 3.2.39
find (GNU findutils) 4.4.0

-----
 Input directory d1:
d1
|-- a1
|-- b1.jpg
`-- d2
    |-- a2
    |-- b2.jpg
    `-- d3
        |-- a3
        |-- b3.jpg
        `-- jpg-something

2 directories, 7 files

-----
 Results:
 Would have run "convert d1/b1.jpg -resize 800x600 d1/b1.jpg"
 Would have run "convert d1/d2/d3/b3.jpg -resize 800x600 d1/d2/d3/b3.jpg"
 Would have run "convert d1/d2/b2.jpg -resize 800x600 d1/d2/b2.jpg"

Best wishes ... cheers, drl