Working with the Unix OS

Unix Shells
two lines
!Y@Y@Z@Z@ZY
cat > file3 &2
exit 1 ;;
esac
while :
do
ans=
# portable way to keep cursor on same line
# tr -d '\012' >&2
echo "$prompt" | tr -d '\012' >&2
read ans
[ -z "$ans" ] && ans="$2" # get default from command
case "$ans" in
[Yy]|YES|yes) exit 0 ;;
[Nn]|NO|no) exit 1 ;;
*) echo "Please answer y/n" >&2 ;;
esac
done
! MVSED
#!/bin/sh
# @(#)mvsed - rename files using sed-script
# rename a list of files using a sed(1) command
# mvsed [-e] sed-script file ...
# -e just outputs the "mv" commands
# (no files are renamed)
# e.g.
# mvsed -e 's/w/BIGW/' awk passwd wall
# outputs:
# mv awk aBIGWk
# mv passwd passBIGWd
# mv wall BIGWall
if [ $# = 0 ]
then
echo "`basename $0`: [-e] sed-script file ..." >&2
exit 2
fi
ECHO=
case "$1" in
-e) ECHO=echo; shift;;
esac
sed="$1"; shift
for file
do
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