broken-link.sh

一本完整的描述Unix Shell 编程的工具书的所有范例

#!/bin/bash
# broken-link.sh
# Written by Lee bigelow <[e-mail]>
# Used with permission.

#A pure shell script to find dead symlinks and output them quoted
#so they can be fed to xargs and dealt with :)
#eg. broken-link.sh /somedir /someotherdir|xargs rm
#
#This, however, is a better method:
#
#find "somedir" -type l -print0|\
#xargs -r0 file|\
#grep "broken symbolic"|
#sed -e 's/^\|: *broken symbolic.*$/"/g'
#
#but that wouldn't be pure bash, now would it.
#Caution: beware the /proc file system and any circular links!
##############################################################


#If no args are passed to the script set directorys to search 
#to current directory.  Otherwise set the directorys to search 
#to the agrs passed.
####################
[ $# -eq 0 ] && directorys=`pwd` || directorys=$@

#Setup the function linkchk to check the directory it is passed 
#for files that are links and don't exist, then print them quoted.
#If one of the elements in the directory is a subdirectory then 
#send that send that subdirectory to the linkcheck function.
##########
linkchk () {
    for element in $1/*; do
    [ -h "$element" -a ! -e "$element" ] && echo \"$element\"
    [ -d "$element" ] && linkchk $element
    # Of course, '-h' tests for symbolic link, '-d' for directory.
    done
}

#Send each arg that was passed to the script to the linkchk function
#if it is a valid directoy.  If not, then print the error message
#and usage info.
################
for directory in $directorys; do
    if [ -d $directory ]
	then linkchk $directory
	else 
	    echo "$directory is not a directory"
	    echo "Usage: $0 dir1 dir2 ..."
    fi
done

exit 0