trailing-slash

实战Linux编程的原代码,希望对学驱动的人能有所帮助

#!/bin/sh
# Ensure that du works properly for an argument that refers to a
# symbolic link, and that is specified with a trailing slash.
# Before coreutils-4.5.3, it would remove a single trailing slash.

if test "$VERBOSE" = yes; then
  set -x
  du --version
fi

pwd=`pwd`
t0=`echo "$0"|sed 's,.*/,,'`.tmp; tmp=$t0/$$
trap 'status=$?; cd $pwd; chmod -R u+rwx $t0; rm -rf $t0 && exit $status' 0
trap '(exit $?); exit $?' 1 2 13 15

framework_failure=0
mkdir -p $tmp || framework_failure=1
cd $tmp || framework_failure=1
mkdir -p dir/1/2 || framework_failure=1
ln -s dir slink || framework_failure=1

if test $framework_failure = 1; then
  echo "$0: failure in testing framework" 1>&2
  (exit 1); exit 1
fi

fail=0

du slink/ | sed 's/^[0-9][0-9]*	//' > out
echo === >> out

# Ensure that with -L we get the same results even without the trailing slash.
du -L slink | sed 's/^[0-9][0-9]*	//' >> out
cat <<\EOF > exp
slink/1/2
slink/1
slink
===
slink/1/2
slink/1
slink
EOF

cmp out exp || fail=1
test $fail = 1 && diff out exp 2> /dev/null

(exit $fail); exit $fail