run a git command on all subdirectories containing a git repository (tested on MAC, should also work on linux - report problems via comments)

git-foreach

#!/bin/bash

SCRIPT=`basename $0`
if [ $# -lt 1 ] || [ "$1" = "-help" ] || [ "$1" = "--help" ] ; then
    cat -- <<EOF

NAME
        ${SCRIPT} - run git command for all directories

SYNOPSIS
        ${SCRIPT} [git-command] [git-arguments]

DESCRIPTION
        ${SCRIPT} checks all subdirectories of the current directory for presence of a git repository
        and then running the supplied git-command.

        Checking is done by searching all direct child directories of the current directory that contain
        a subdirectory named '.git'.

EXAMPLES

        ${SCRIPT} status -s

                output short status for each repository.

        ${SCRIPT} fetch

                fetch changes for each repository.

EOF
exit
fi

# get arguments to git
ARGS=$*

# find and iterate over repositories
find . -type d -depth 2 -name .git -exec bash -c "
    REPODIR='{}'
    DIR=\${REPODIR/\/.git/}
    DIR=\${DIR/^.\//}
    printf '\n\033[1;34m%s\033[m\n' "\$DIR" 
    ( cd "\$DIR" && git $ARGS )
" \;