CSH script Syntax Instance _linux shell

CSH Example Reference:

Copy Code code as follows:

#!/bin/csh-vx
#csh-VX Show the command before running to help debug

#just to check syntax
#csh-N $

#argv
if ($ #argv < 2) Then
echo "Sorry, but you entered too few parameters"
echo "Usage: $ arg1 arg2
Exit
endif
Set arg1 = $
Set arg2 = #2

foreach I ($*)
Echo $i
End

#execute commands
echo "Hello there ' WhoAmI". How do you Are? "
echo "You are currently using ' hostname ' and '" the ' date '
echo "Your directory is ' pwd '"
WhoAmI
Hostname
Date
Pwd

#var
Set name = Mark
Echo $name
Set name = "Mark Meyer" # If the string has spaces, 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 ' array
Shift #if no argument is G Iven, it'll 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< br> >=        numerical greater than or equal to
>          numerical greater than
<         Numerical less than

-e file           file merely exists (May is protected from user) br>-R file           file exists and is readable by user
-W FILE&N bsp;          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 a ordinary file-D file           file is a directory

! --Negate
&&--Logical AND
|| --Logical OR

#if-else
# run cmd as if expression
if ({grep-s junk $}) then
echo "We found junk in file"
endif
# Check if the VAR is defined
if ($?dirname) then
LS $dirname
endif

if (-e somefile) then
grep $ somefile
Else
echo "Grievous error! The 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 <John Doe Surrey Lane London, UK 5E7 j2k
Angela Langsbury Knightsbridge, Apt. K4 Liverpool
John Major 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