csh实例 参考：
#!/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? echo $status # a numeric variable, usually used to retun error codes
#Arithmetic variables @ i = 2 @ k = ($x - 2) * 4 @ k = $k + 1 @ i-- @ i++
#array set name = (mark sally kathy tony) echo $#name # num of the array echo $name[1] echo $name[4] echo $name[2-3] echo $name[2-] # all elements from 2 to the end echo $name[1-3] echo $name[$i] set name = ($name doran) set name = (doran $name) set name = ($name[1-2] alfie $name[3-]) shift name # get rid of the frist element of the array shift #if no argument is given, it will get rid of argv
#Expressions and operators == equal (either strings or numbers) != not equal (either strings or numbers) =~ string match !~ string mismatch <= numerical less than or equal to >= numerical greater than or equal to > numerical greater than < numerical less than
-e file file merely exists (may be protected from user) -r file file exists and is readable by user -w file file is writable by user -x file file is executable by user -o file file is owned by user -z file file has size 0 -f file file is an ordinary file -d file file is a directory
! -- negate && -- logical and || -- logical or
#if-else # run cmd as if expression if ({grep -s junk $1}) then echo "We found junk in file $1" endif # check if the var is defined if ($?dirname) then ls $dirname endif
if (-e somefile) then grep $1 somefile else echo "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