csh实例 参考：
复制代码 代码如下:
#!/bin/csh -vx
#csh -vx show the command before running to help debug
#just to check syntax
#csh -n $0
#argv
if ($#argv < 2) then
echo "Sorry, but you entered too few parameters"
echo "usage: $0 arg1 arg2
exit
endif
set arg1 = $1
set arg2 = #2
foreach i ($*)
echo $i
end
#execute commands
echo "Hello there `whoami`. How are you today"
echo "You are currently using `hostname` and the time is `date`"
echo "Your directory is `pwd`"
whoami
hostname
date
pwd
#var
set name = Mark
echo $name
set name = "Mark Meyer" # if the string has space, must use ""
echo $name
# it means set to NULL
set name =
unset name
# get user input
set x = $<
set current_user = `whoami`
#buildin vars
echo $user # who am I"We found junk in file $1"
endif
# check if the var is defined
if ($"Grievous error! Database file does not exist".
endif
#foreach
foreach i (*)
if (-f $i) then
echo "============= $i ==================="
head $i
endif
if (-d $i) then
(cd $i; headers)
endif
end
#while
while ($#argv > 0)
grep $something $argv[1]
end
@ n = 5
while ($n)
# do something
@ n--
end
#switch-case
switch ($argv[$i])
case quit:
break # leave the switch statement
case list:
ls
breaksw
case delete:
case erase:
@ k = $i + 1
rm $argv[$k]
breaksw
endsw
#here document
grep $i <<HERE
John Doe 101 Surrey Lane London, UK 5E7 J2K
Angela Langsbury 99 Knightsbridge, Apt. K4 Liverpool
John Major 10 Downing Street London
HERE
cat > tempdata <<ENDOFDATA
53.3 94.3 67.1
48.3 01.3 99.9
42.1 48.6 92.8
ENDOFDATA
exit 0