nl

实战Linux编程的原代码,希望对学驱动的人能有所帮助

#!/bin/sh
# exercise nl functionality

if test "$VERBOSE" = yes; then
  set -x
  nl --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

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

fail=0

echo a | nl > out || fail=1
echo b | nl -s%n >> out || fail=1
echo c | nl -n ln >> out || fail=1
echo d | nl -n rn >> out || fail=1
echo e | nl -n rz >> out || fail=1
cat <<\EOF > exp
     1	a
     1%nb
1     	c
     1	d
000001	e
EOF

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

(exit $fail); exit $fail