Hi jejemonx...
This is what vbe was referring to assuming you are using 'bash':
AND, an example of how it works:
As you can see whether you input variables 'b' and 'c' or not they have 'NULL' values so there will always be 3 variables.
You could always use 3 separate 'read's and check each one for validity and restart the loop as required if one or more is not a number...
I need the date validation. I searched in the google but i didn't find my requirements.
requirements:
1) user has to enter the date in YYYY/MM/DD format
2) MM validations
3) DD validations.
and if the month is april it should allow 30 days only and for May month it should allow 31 days like... (1 Reply)
Hello everyone!
I am a bit inexperienced with administering queueing programs. I installed Torque (a PBS derivative) on a Linux cluster and it is running well. There is one annoying problem though: users can run massively parallel jobs and serial jobs too. Almost all users do a mix of the two. I... (0 Replies)
Hi i am a total noob at shell scripting. i was wondering if somebody could help me with my script.
i want the script to search the dev folder for the burner file
because they are different between distrubutions? as i under stand it.
this i the script.
#!/bin/bash
echo "Script för att bränna 360... (4 Replies)
ok the user can only enter a number if a letter is entered it shouldnt be accepted
This is what i have so far
read -p "How many cars to enter:" cars
until
do
read -p "Invalid number. Please re-enter:" $tags
done (5 Replies)
Hello
Does the unix korn shell provide a function to convert number entered in command line argument to text or Character so that in next step i will convert Chr to Hex (6 Replies)
Hello,
I am new to awk and I am trying to figure out how to print an output based on user input.
For example:
ubuntu:~/scripts$ steps="step1, step2, step3"
ubuntu:~/scripts$ echo $steps
step1, step2, step3
I am playing around and I got this pattern that I want:
... (3 Replies)
Hi Experts,
path=/db/files/
format=$1
User can enter any file format.compare the user file format with actual file format existed in the directory /db/files. User enter all characters as "A" apart from date format.
example1: user will be entering the file format AAA_AA_YYYYMMDD.AAA
Actual... (6 Replies)
Hello All,
I have a file of ip addresses called activeips.txt
What I'm trying to do is run a simple bash script that has a loop in it. The loop is a cat of the IP addresses in the file.
The goal is to run 2 nmap commands to give me outputs where each address in the list has an OS... (11 Replies)
Discussion started by: Dirk_Pitt
11 Replies
LEARN ABOUT OPENSOLARIS
readonly
readonly(1) User Commands readonly(1)NAME
readonly - shell built-in function to protect the value of the given variable from reassignment
SYNOPSIS
sh
readonly [name]...
ksh
**readonly [name [= value]]...
**readonly -p
ksh93
++readonly [-p] [name [= value]]...
DESCRIPTION
sh
The given names are marked readonly and the values of the these names may not be changed by subsequent assignment. If no arguments are
given, a list of all readonly names is printed.
ksh
The given names are marked readonly and these names cannot be changed by subsequent assignment.
When -p is specified, readonly writes to the standard output the names and values of all read-only variables, in the following format:
"readonly %s=%s
", name, value
if name is set, and:
"readonly $s
", name
if name is unset.
The shell formats the output, including the proper use of quoting, so that it is suitable for reinput to the shell as commands that achieve
the same value and readonly attribute-setting results in a shell execution environment in which:
1. Variables with values set at the time they were output do not have the readonly attribute set.
2. Variables that were unset at the time they were output do not have a value at the time at which the saved output is re-input to
the shell.
On this manual page, ksh(1) commands that are preceded by one or two ** (asterisks) are treated specially in the following ways:
1. Variable assignment lists preceding the command remain in effect when the command completes.
2. I/O redirections are processed after variable assignments.
3. Errors cause a script that contains them to abort.
4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a
variable assignment. This means that tilde substitution is performed after the = sign and word splitting and file name genera-
tion are not performed.
ksh93
readonly sets the readonly attribute on each of the variables specified by name which prevents their values from being changed. If =value
is specified, the variable name is set to value before the variable is made readonly.
If no names are specified then the names and values of all readonly variables are written to standard output.
readonly is built-in to the shell as a declaration command so that field splitting and pathname expansion are not performed on the argu-
ments. Tilde expansion occurs on value.
-p Causes the output to be in a form of readonly commands that can be used as input to the shell to recreate the current set of readonly
variables.
On this manual page, ksh93(1) commands that are preceded by one or two + symbols are treated specially in the following ways:
1. Variable assignment lists preceding the command remain in effect when the command completes.
2. I/O redirections are processed after variable assignments.
3. Errors cause a script that contains them to abort.
4. They are not valid function names.
5. Words, following a command preceded by ++ that are in the format of a variable assignment, are expanded with the same rules as a
variable assignment. This means that tilde substitution is performed after the = sign and field splitting and file name genera-
tion are not performed.
EXIT STATUS
ksh93
The following exit values are returned:
0 Successful completion.
>0 An error occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO ksh(1), ksh93(1), sh(1), typeset(1), attributes(5)SunOS 5.11 2 Nov 2007 readonly(1)