x8

实战Linux编程的原代码,希望对学驱动的人能有所帮助

#!/bin/sh
# verify that od -t x8 works properly
# This would fail before coreutils-4.5.2.

if test "$VERBOSE" = yes; then
  set -x
  od --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
echo abcdefgh |tr -d '\n' > in || framework_failure=1

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

fail=0

od -An -t x8 in > out-raw || fail=1
sed 's/^ //;s/\(..\)/\1 /g;s/ $//' out-raw \
  | tr ' ' '\n' \
  | sort -n \
  > out

od -An -t x1 in \
  | sed 's/^ //' \
  | tr ' ' '\n' \
  | sort -n \
  > exp

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

(exit $fail); exit $fail