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An Introduction to Shells in General
Axis Communications AB provides NO support for application development of any kind. The information
here is provided "as is", and there is no guarantee that any of the examples shown will work in your
particular application.
Revision 1.02 October 2002 68
The case statement
The case statement enables you to compare a pattern with several other patterns and execute a
block of code if a match is found. The syntax of the case statement is:
case string in
str1)
commands;;
str2)
commands;;
*)
commands;;
esac
string
is compared to str1 and str2. If one of these strings matches string1, the
commands up until the double semicolon (;;) are executed. If neither str1 nor str2 matches
string, the commands associated with the asterisk are executed. This is the default case
condition because the asterisk matches all strings.
The for statement
The for statement executes the commands that are contained within it a specified number of
times. The syntax of the for statement is:
for var1 in list
do
commands
done
In this form, the for statement executes once for each item in the list. This list can be a variable
that contains several words separated by spaces, or it can be a list of values that is typed directly
into the statement. Each time through the loop, the variable var1 is assigned the current item in
the list, until the last one is reached.
The second form of for statement has the following syntax:
for var1
do
statements
done
In this form, the for statement executes once for each item in the variable var1. When this
syntax of the for statement is used, the shell program assumes that the var1 variable contains
all the positional parameters that were passed in to the shell program on the command line.
The
while statement
Another iteration statement offered by the shell programming language is the
while statement.
This statement causes a block of code to be executed while a provided conditional expression is
true. The syntax for the while statement is the following:
- Table of Contents 2
- 1 Introduction 5
- 2 Embedded Scripts 6
- 2.2 Shell 7
- Running Scripts via Telnet 12
- 3.4.1.1 Options 14
- 3.4.1.3 Examples 15
- 3.4.2 sftpclient 16
- 3.4.3 smtpclient 17
- 3.4.4 shttpclient 18
- 3.4.5 statusled 19
- 4 An Introduction to PHP3 20
- 4.1.1 alert.lib 21
- 4.1.2 ftp.lib 21
- 4.1.3 log.lib 22
- 4.1.4 mail.lib 22
- 4.1.5 ppp.lib 23
- 4.1.6 Examples 24
- 4.2 PHP3 script examples 26
- 4.2.1.1 Driver.php3 27
- 4.2.2.1 The task.list 29
- 4.2.2.2 The Script 29
- An Introduction to PHP3 35
- 5.1 The mish shell 40
- 5.2 Shell commands 40
- 5.3.1 basename 44
- 5.3.2 cat 44
- 5.3.3 chroot 44
- 5.3.4 cp 44
- 5.3.5 cut 45
- 5.3.6 date 45
- 5.3.7 dd 45
- 5.3.8 df 46
- 5.3.9 dirname 46
- 5.3.10 du 46
- 5.3.11 echo 47
- 5.3.12 env 47
- 5.3.13 expr 47
- 5.3.14 false 48
- 5.3.15 fbset 48
- 5.3.16 find 48
- 5.3.17 grep 49
- 5.3.18 halt 49
- 5.3.19 head 49
- 5.3.20 hostname 50
- 5.3.21 id 50
- 5.3.22 init 50
- 5.3.23 ln 52
- 5.3.24 logger 53
- 5.3.25 logname 53
- 5.3.26 logread 53
- 5.3.27 ls 53
- 5.3.28 mkdir 54
- 5.3.29 mkfifo 54
- 5.3.30 mknod 54
- 5.3.31 mount 55
- 5.3.32 mv 55
- 5.3.33 poweroff 55
- 5.3.34 printf 56
- 5.3.35 pwd 56
- 5.3.36 rdate 56
- 5.3.37 reboot 56
- 5.3.38 rm 56
- 5.3.39 rmdir 57
- 5.3.40 sed 57
- 5.3.41 sleep 57
- 5.3.42 sort 57
- 5.3.43 stty 58
- 5.3.44 sync 58
- 5.3.45 tail 58
- 5.3.46 tee 58
- 5.3.47 test 59
- 5.3.48 touch 59
- 5.3.49 tr 59
- 5.3.50 true 60
- 5.3.51 tty 60
- 5.3.52 umount 60
- 5.3.53 uname 60
- 5.3.54 uniq 61
- 5.3.55 usleep 61
- 5.3.56 wc 61
- 5.4 LIBC NSS 62
- 5.5 Using Variables 64
- 5.8 The test Command 66
- 5.8.3 File operators 67
- 5.8.4 Logical operators 67
- 5.8.5 Conditional statements 67
- 6 Shell Script Examples 70
- 6.2 Script examples 72
- 6.2.1.1 Task.list 73
- Shell Script Examples 75
- 6.2.3.1 Task.list 79
- 6.2.4.1 Task.list 80
- 6.2.5.1 TASK.LIST 84
- 7 Troubleshooting 85
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