First, replace the exit 1 by return 1.
Then loop around the input until it's okay.
Here it checks the exit status of the read and the validate. If not 0(=okay) it runs the empty loop body and repeats.
The : (noop) satisfies the syntax.
Hi
I have below file with 3 rd column as date ....i want to make 3 column to mm/dd/yyyy .
in the below file 2 row date is like 1/23/1994 so i want to append '0'
to month i,e. 01/23/1994 and in the 3 row date is like 6/4/1994 ---so i want this to 06/04/1994
Source:... (1 Reply)
Hi guys!
Im tryin to set up a login script that allows a user to login with only the following "forename.surname" .
The username all contain lowercase letters so thats not a problem to sort out, but im having problems making sure that they can only enter 1 " . " . the code i have so far is this... (1 Reply)
I'm kinda new in shell scripting. How do i validate an input from a user to conform to requirement. For example,
echo "Enter First Name: "
read FName
echo "Enter Date of Employment (dd/mm/yyyy): "
read DoE
If the user enters data that is alphanumeric, it accepts it. I hope i've... (1 Reply)
Hi All,
We need to use & execute some several scripts before loading the data successfully using Informatica.
Can you help me the below scenario:
We will be receiving the files from different countries, and using ftp all the files will be placed onto the server. The file structure will be (.csv... (6 Replies)
Hi,
I am new to Unix shell scripting and need help to add some validation to an existing script.
I've made a script that takes two argument (input) but I want the script to display an error message when nothing (null) is entered. So far I managed to validate the fist argument but fail to... (2 Replies)
Hi All,
I need to write a small piece of code to check the following.
name should contain (A-Z), spaces, hyphens & apostrophes
I need to generate regular expressions for the same.
Please help me out as i am not familiar with regular expressions. (1 Reply)
Hi friends,
I have been writing one c code to validate any url passed by a user.
Here is the code I have so far coded.
I am using one dictionary file to check values like http, https, www, ftp, etc for the URL that a user will pass for validation.
My code so far holds good for every thing... (1 Reply)
Hi,
I want a script to do the following:
1)I want to find all latest files with extension *.doc and write those files to a log file which i did.
my script: find *.doc -mtime -1 -ls > test.log
2) suppose if there is no such latest files extracts script should write "Server... (8 Replies)
Hi there,
As a part of file validation, I needed to check for delimiter count in the file.
My aim is to find, how many records have failed to have predefined numbers of delimiters in the file.
My code looks like below
i=`awk -F '|' 'NF != 2 {print NR, $0} ' ${pinb_fldr}/${pfile}DAT |... (3 Replies)
Hi All
I am trying to validate a value using if condition
requirement is need to check whether its a valid numeric value
the input contains ( space, #N/A and negative and positive decimal values and Zeros)
if it contains the space, I need to display the error message as space
... (15 Replies)
Discussion started by: tsurendra
15 Replies
LEARN ABOUT REDHAT
while
while(n) Tcl Built-In Commands while(n)
__________________________________________________________________________________________________________________________________________________NAME
while - Execute script repeatedly as long as a condition is met
SYNOPSIS
while test body
_________________________________________________________________DESCRIPTION
The while command evaluates test as an expression (in the same way that expr evaluates its argument). The value of the expression must a
proper boolean value; if it is a true value then body is executed by passing it to the Tcl interpreter. Once body has been executed then
test is evaluated again, and the process repeats until eventually test evaluates to a false boolean value. Continue commands may be exe-
cuted inside body to terminate the current iteration of the loop, and break commands may be executed inside body to cause immediate termi-
nation of the while command. The while command always returns an empty string.
Note: test should almost always be enclosed in braces. If not, variable substitutions will be made before the while command starts execut-
ing, which means that variable changes made by the loop body will not be considered in the expression. This is likely to result in an
infinite loop. If test is enclosed in braces, variable substitutions are delayed until the expression is evaluated (before each loop iter-
ation), so changes in the variables will be visible. For an example, try the following script with and without the braces around $x<10:
set x 0
while {$x<10} {
puts "x is $x"
incr x
}
SEE ALSO
break(n), continue(n), for(n), foreach(n)
KEYWORDS
boolean value, loop, test, while
Tcl while(n)