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