hi,
I am new script learner,
so my basic doubt is ,
how to store value of any command in a variable example
i want to stote the output of this in a variable c.
so that i can use c in if else loop.
and when do we use " ` " symbol in script..
can anyone also tell for learner whick ebook i should use..
On the below "IF" i test if the user have put the first argument.
I also would like to test if the user have written a second argument.
So, my doubt is:
- How can i evaluate 2 conditions on a if statement? How is the OR created?
- How can i to verify if the second argument is non... (1 Reply)
Hi,
I have a script called sam.sh which consists of a single echo statement like this
#/usr/bin/ksh
echo "Mani"
I changed the mode for the script by giving chmod a+x sam.sh.
If I want to execute the scrpt by just giving the name at the command line "sam.sh", what should I necessarily do?... (3 Replies)
Hi all,
Today I was just fooling around with directories and faced this. I create a directory 'testdir' and create a file 'myfile' inside it.
gandalf@gondor:~$ mkdir testdir
gandalf@gondor:~$ cd testdir
gandalf@gondor:~/testdir$ touch myfile
Then I set the following permissions for the... (7 Replies)
Hi,
While reading a shell script ,i have come accross the following statements.
script_name_full=$0
***script_name=${script_name_full##*\}
***script_name_noexst=${script_name%%\.ksh}
host_name=`hostname`
***host_name_short=${host_name%%\.*}
can anybody tell me what is the purpose of marked... (5 Replies)
Hi,
I'm a newbie in shell script.
I have a problem in running my a.out in a bash shell script named vetri . The following is the code.
#!bash/bin
./a.out abc.xyz
where ./a.out is a c++ bin file and abc.xyz is an argument. My ./a.out expects an input (cin >> temp). How can I give the... (5 Replies)
Hi Friends!!
I want to add a / at the end of a number. for example i have CQ65758 /, in this case i want to shift that backspace one space to the left so the my result becomes CQ65758/.
How can i do that with sed.
Thanks
Adi (3 Replies)
Lets say I wanted to create a script that would show what people are doing on my machine using the w command and refresh in about 6 seconds. What would be the easiest way to do this? I pretty much want the script to loop until I stop it.
I'm using the BASH shell by the way.
Help is appreciated.... (1 Reply)
Im trying to make a script that simply adds a word to the last available line in a txt file without overwriting any previous lines.
Ive googled this and there are great examples but no one explain what each function does, and i dont entirely understand how it works.
Basically Im looking for... (7 Replies)
Hi,
I'm new to this and very much interested to learn unix.
Can any one explain me the symbols y we use this is scripting(~ and $).
It would be great if some one explain with the eg.
Thanks
Naveen A (2 Replies)
Discussion started by: Pranaveen
2 Replies
LEARN ABOUT OPENDARWIN
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)