# these shell code used to test file attributes # block device device0="/dev/sda2" if [ -b "$device0" ] then echo "$device0 is a block device." fi # character device device1="/dev/ttyS1" # PCMCIA modem card if [ -c "$device1" ] then echo "$device is a character device." fi # pipe function show_input_type() { [ -p /dev/fd/0 ] && echo PIPE || echo STDIN } show_input_type "Input" # STDIN echo "Input" | show_input_type # pipe # block device device0="/dev/sda2" if [ -b "$device0" ] then echo "$device0 is a block device." fi # character device device1="/dev/ttyS1" # PCMCIA modem card if [ -c "$device1" ] then echo "$device is a character device." fi # pipe function show_input_type() { [ -p /dev/fd/0 ] && echo PIPE || echo STDIN } show_input_type "Input" # STDIN echo "Input" | show_input_type # pipe
1 #!/bin/bash 2 # Find dead symlinks and output them quoted, 3 # so they can be fed to xargs and dealt with. 4 # 5 # e.g. sh broken-link.sh /somedir /someotherdir | xargs rm 6 # 7 # This, however, is better method: 8 9 # find "somedir" -type l -print0 |\ 10 # xargs -r0 file |\ 11 # grep "broken symbolic" |\ 12 # sed -e 's/^\|: *broken symbolic.*$/"/g' 13 14 # But above code would not be PURE Bash 15 16 # Caution: beware the /proc file system and any circular links! 17 18 # If no args are passed to the script set directories-to-search 19 # to current directory. Otherwise set the directory-to-search to 20 # the args passed. 21 22 [ $# -eq 0 ] && directorys=`pwd` || directorys=$@ 23 24 linkchk() { 25 for element in $1/*; do 26 [ -h "$element" -a ! -e "$element" ] && echo \"$element\" 27 [ -d "$element" ] && linkchk $element 28 # Of course, '-h' test for symbolic link, '-d' for directory. 29 done 30 } 31 32 for directory in $directorys; do 33 if [ -d $directory ] 34 then linkchk $directory 35 else 36 echo "$directory is not a directory" 37 echo "Usage: $0 dir1 dir2 ..." 38 fi 39 done 40 41 exit $?
