10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I have a script to start/stop/restart the tomcat application. When we run the script first time i.e stop/start it set all env variables(DISTRIB_ID,NAME,TOMCAT_CFG,....etc),but when we restart the tomcat it is running in the same shell.....I need to set the variables when i restart the tomcat(in the... (1 Reply)
Discussion started by: praveen265
1 Replies
2. Shell Programming and Scripting
Help needed (1 Reply)
Discussion started by: Chand Shrestha
1 Replies
3. Shell Programming and Scripting
I am trying to use two nested for loops to process some files and then create a new file using both variables in the output file name. I have several files in this naming style:
S1_L3_all_R1.fastq
S1_L3_all_R2.fastq
S1_L4_all_R1.fastq
S1_L4_all_R2.fastq
.
.
S1_L8_all_R1.fastq... (3 Replies)
Discussion started by: aminards
3 Replies
4. Shell Programming and Scripting
Hi,
This is probably going to be very simple but i came across something i can't quite explain. Here is the situation: i have a list of files, which i'd like to process one by one (get the size, make some tests, whatever) and generate some statistics using different variables.
Something... (5 Replies)
Discussion started by: m69w
5 Replies
5. Shell Programming and Scripting
Hi,
I am running a shell script that executes a program. Inside this program, variables are also referenced using a dollar symbol, eg. $a, $thething, and the shell script is misinterpreting them as variables relevant to the shell script rather than relevant to the program run from inside the... (2 Replies)
Discussion started by: TheBigH
2 Replies
6. Shell Programming and Scripting
Hi script gurus.
I have need to know how to use for loop with multiple variable.
Basically lets take for example /etc/passwd file has following entries
The above cat command will basically first greps the real users that have email addresses then converts ':' to '+' then using cut... (4 Replies)
Discussion started by: sparcguy
4 Replies
7. Shell Programming and Scripting
Hello all,
I would like to declare and use variables inside an ssh session. I have the feeling that it's not possible. Here is the situtation simpified:
#:/bin/sh
test="salut"
echo $test
ssh hudson@10.41.21.99 <<EOF
export testssh="salut"
echo testssh=$testssh
... (4 Replies)
Discussion started by: Lotfus
4 Replies
8. Shell Programming and Scripting
Hi
I am using 'awk" to get file size and date of the file:
op - sundev3 $ ls -l /bb/bin/tsfiles.sel | awk '{print $5 $6 $7}'
1587May8
May be somobody knows the way to combine this command with variable assignmet inside the awk, so I would have variables SIZE, MONTH and DATE assigned after... (1 Reply)
Discussion started by: aoussenko
1 Replies
9. Shell Programming and Scripting
Surely there's an easier way to do this, lets see if anyone knows! I am new to scripting so go easy on me!
I have the following script and at the moment it doesn't work and I believe the problem is that I am using a while loop within a while loop. When I run the script using sh -x I can see... (6 Replies)
Discussion started by: StevePace
6 Replies
10. Shell Programming and Scripting
I am trying to pass a regular expression variable from a simple script to sed
to remove entries from a text file
e.g.
a='aaaa bbbb cccc ...|...:'
then executing sed from the script
sed s'/"'$a"'//g <$FILE > $FILE"_"1
my output file is always the same as the input file !!
any... (5 Replies)
Discussion started by: Daniel234
5 Replies
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)