C-shell excellent program

C-shell excellent program-general Linux technology-Linux programming and kernel information. The following is a detailed description. 1. switch usage. Note that each case must end with breaksw
Otherwise, the next case command will be executed.
(1) In addition, $ <means to obtain the user's stand input
(2) If the-n option is added to echo, the cursor will stay at the end of the row.

Echo-n "Input one color :"
Set STOPLIGHT =$ <
Switch ($ STOPLIGHT)
Case red:
Echo "red"
Breaksw
Case orange:
Echo "orange"
Breaksw
Case green:
Echo "green"
Breaksw
Default:
Echo "you input $ STOPLIGHT"
Endsw

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2. Use set to obtain the variable, set ABC = "I am ABC"
You can also use 'command' to obtain the command.
Besides, case can also be replaced by a ten-character *.

Set VER = 'uname-R'
Switch ($ VER)
Case 5.5:
Echo "run the setup of $ VER"
Breaksw
Case 5.3:
Echo "run the setup of $ VER"
Breaksw
Case 5 .*:
Echo "like 5.x"
Breaksw
Case 4 .*:
Echo "like 4.x"
Breaksw
Default:
Echo "no idea"
Endsw

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3. if syntax, compare numbers

Set n1 = 1
Set n2 = 2
If ($ n1 = $ n2) then
Echo "$ n1 Equal $ n2"
Else
Echo "$ n1 Not Equal $ n2"
Endif


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4. if syntax, comparison string

Set n1 = abcdef
Set n2 = abcde
If ($ n1 = $ n2) then
Echo "$ n1 Equal $ n2"
Else
Echo "$ n1 Not Equal $ n2"
Endif


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5. if syntax, similar strings

Set n1 = abcdef
Set n2 = abcde
If ($ n1 = ~ $ N2) then
Echo "$ n1 Like $ n2"
Else
Echo "$ n1 Not Like $ n2"
Endif


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6. if syntax, compare the number size

Set n1 = 1
Set n2 = 2
If ($ n1> $ n2) then
Echo "$ n1> $ n2"
Else
Echo "$ n1 <$ n2"
Endif


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7. programs executed once per minute

# Mm is equal to the number of [minutes] of the current day
Set mm = 'date | cut-d'-f4 | cut-d:-f2'

If (-r $ 0.out) then
Rm $ 0.out
Touch $ 0.out
Else
Touch $ 0.out
Endif

While ($ mm <= 16)
Set mm = 'date | cut-d'-f4 | cut-d:-f2'
Echo "$ mm now is 'date '"
Sleep 60
# E cho "$ mm now is 'date'" >>$ 0.out
End
Echo "Over" >>> 0.out


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8. An example of loop and the use of expr for adding
The loop syntax is as follows:
Foreach number (1 2 3)
Echo $ number
End

Set counter = 0
While ($ counter <= 10)
Echo "sleeping for 5 seconds"
Sleep 5
Counter = 'expr $ counter + 1'
End


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9. Set a program that uses the month and date of the current day as the file name
For example, if today is 10/02, $ prefix will be equal to the program + 1002
Date. csh1002

Set prefix = 'basename $ 0' 'date' + % m % d''
Echo $0
Echo $ prefix


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10. Remove the font string from the specified file in the foreach Loop


Foreach file ([B, e, g, h, s] *. html)
Echo-n "Processing $ file, remove the line number 'grep-n font $ file '"

# $ Log indicates that this $ file contains several font strings
Set log = 'grep-c font $ file'
If ($ log = '0') then
Echo ", pass $ file"
Else
# First find the number of rows that appear font for the first time of the file. If 3, $ cmd = 3d
Set cmd = 'grep-n font $ file | cut-d:-f1 | head-1 'd
# Use sed to execute the delete action and output the result to $ {file} 1
Sed $ cmd $ file >$ {file} 1
# If $ {file} 1 has no information, passing
If (-z $ {file} 1) then
Echo ", $ {file} 1 is zero"
Else
Cp $ {file} 1 $ file
Rm {$ file} 1
Echo ", $ file remove OK"
Endif
Endif
End

# Later I saw the further usage of sed and found that the previous writing was too stupid. Try this
# Sed/font/d $ file >$ {file} 1
# Once OK, I am really stupid

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11. function: add Xxxx

Foreach file (sky *. html)
Set filetitle = ftitle
# The main part is the sed part s/^ * //, indicating to delete the blank space before the first character of the row
Echo" 'Grep back $ file | head-1 | sed-e's/^ *//''"> $ Ftitle

# Insert the line just now.
Head-1 $ file >$ {file} head
Sed 1d $ file >$ {file} 1
Cat $ ftitle >>> {file} head
Cat $ {file} 1 >$ {file} head
Cp $ {file} head $ file
Rm $ {file} 1
Rm $ ftitle
Rm $ {file} head

Echo "$ file OK"
End

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12. A program that actually creates an ftp server
It contains many applications and is of reference value.
(Unfinished)

Set path = (/usr/bin/usr/sbin)
#
Set true = 'grep-c ftp/etc/passwd'
If ($ true = 0) then
Echo "no ftp user in your system"
Echo-n "do you want to create the ftp user? "
Set answer =$ <
If ($ answer = 'y' | $ answer = 'y') then
Set maxid = 'sort/etc/passwd | tail-1 | cut-d:-f3'
Echo $ maxid
Set newid = 'expr $ maxid + 1'
Echo $ newid
Echo "/usr/sbin/useradd-d/home1/ftp-u $ newid-s/etc/false ftp"
Endif
Else
Echo "Good. Your system already has the ftp user ."
Set ftphome = 'grep ftp:/etc/passwd | cut-d:-f6'
Echo $ ftphome
Endif

If (-z $ ftphome) then
Echo "ftphome must be non-null"
Exit 2
Endif

If ($ ftphome = "/usr" | $ ftphome = "/") then
Echo "ftphome can't be/or/usr"
Exit 2
Endif

# Create the ftp home directory
If (! -D $ ftphome) then
Echo "mkdir $ ftphome"
Endif

Echo "Setting up the ftphome for SunOS 'uname-R '"

If (! -D $ ftphome) then
Echo "mkdir-p $ ftphome/usr/bin"
Endif

Cp/bin/ls $ ftphome/usr/bin

Chmod 111 $ ftphome/usr/bin/ls
Chown root $ ftphome/usr/bin
Chmod 555 $ ftphome/usr/bin

If (-r $ ftphome/bin) then
Mv-f $ ftphome/bin $ ftphome/Obin
Endif
Ln-s usr/bin $ ftphome


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13. Obtain the UID of the user

If ($ # argv = 0) then
Echo "$0 usage: $1 username"
Exit 2
Endif

Set uid = 'grep $1/etc/passwd | cut-d:-f3'
Echo $ uid


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14. Replace html in the specified file with htm

Foreach file (*. html)
Echo "Processing $ file ..."
Sed s/html/htm/$ file >$ {file} 1
Cp $ {file} 1 $ file
Rm $ {file} 1
End


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15. A simple example. Just look at it.

#! /Bin/csh-f
Echo .................
Echo WELCOME to \ * tape copy \*
Echo .................
Echo Enter your name:
# $ <Can read from stand input
Set name = $ <
Echo ""
Echo Hi $ name \!
Set D = 'date'
Echo Today \'s date is $ D [1] $ D [2] $ D [3]
If ($ D [1] = Mon) then
Echo -------------------------------------------------------------
Echo Today is $ D [1] day $ name, it \'s time to copy your directorys \!
Echo -------------------------------------------------------------
Else
Echo -------------------------------------------------------------
Echo Today is $ D [1] day $ name, no tape copies today \!
Echo -------------------------------------------------------------
Endif


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16. A finger Program

Set FINGER = "/usr/ucb/finger"

If (-x $ FINGER) then
If ($ # argv = 0) then
Cat <TAG
---------------------------------
Hahahah ....
---------------------------------
TAG
Else
$ FINGER "$ *"
Endif

Else
Echo "Cannot find finger on this system ."
Endif


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17. Methods for obtaining Variables

Set W = 'Who-R'
Echo $ W [9]



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18. Change the file name and Set *. html --> *. htm

# Rename *. html to *. htm
Echo-n "This will change *. html to *. htm. Can I continue? (Y/n ):"
Set input =$ <
If ($ input! = "Y" & $ input! = "Y") then
Echo "OK. Quit ..."
Exit 2
Endif

Foreach file (*. html)
Echo "Processing $ file to 'basename $ file .html'.htm"
Mv $ file 'basename $ file .html'.htm
End

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19. Change the file name and Set *. htm --> *. html

Echo-n "This will change *. htm to *. html. Can I continue? (Y/n ):"
Set input =$ <
If ($ input! = "Y" & $ input! = "Y") then
Echo "OK. Quit ..."
Exit 2
Endif

# Rename *. htm to *. html
Foreach file (*. htm)
Echo "Processing $ file to 'basename $ file .htm'.html"
Mv $ file 'basename $ file .htm'.html
End

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20. Change the archive name in upper case to lower case.
Tr string1 string2 will set the string of standard input,
All corresponding string1 are replaced by string2

Foreach file (*)
Mv $ file 'echo $ file | tr' [A-Z] ''[a-z]''
End

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21. Change the lower-case file name to the upper-case file name.

Foreach file (*)
Mv $ file 'echo $ file | tr' [a-z] ''[A-Z]''
End