10 More Discussions You Might Find Interesting
1. UNIX for Beginners Questions & Answers
I have if loop with multiple variable value check in if loop. How can i print only if loop satisfied variable and its value in shell script ? I dont want to check each variable in if loop. That makes my script larger.
if ]
then
echo "Only satisfied variable with value"
... (3 Replies)
Discussion started by: prince1987
3 Replies
2. Shell Programming and Scripting
Hello
I would to write the test on one line like :
declare -i x=0 y=0
........
some code assign value 0 or 1 to x and y
........
# if either x or y or both is set to 1, then do something
if -o ; then
do_something
fi
Any help is welcome (2 Replies)
Discussion started by: jcdole
2 Replies
3. Shell Programming and Scripting
Hi,
I am new to shell/bash script. I am trying to run below script
#!/bin/bash
a=0
b=10
if
then
echo "a is equal to be"
else
echo "a is not equal to be"
fi
MAX=10
while
do
echo $a
a='expr $a + 1'
done (1 Reply)
Discussion started by: Mallikgm
1 Replies
4. Shell Programming and Scripting
hi, im learning python language. and my teacher gives me this question on class:
Boolean expression :
not (p or not q)
what is the correct answer for that? i still dont understand, and please give me a link for a new beginner in python to learn.
thanks (1 Reply)
Discussion started by: jazzyzha
1 Replies
5. Shell Programming and Scripting
# check host value regex='^(||1|2|25)(\.(||1|2|25)){3}$' if ')" != "" ]; then if ]; then echo host $host not found exit 4 fi elif ]; then echo $host is an invalid host address exit 5 fi (1 Reply)
Discussion started by: kevin298
1 Replies
6. UNIX for Dummies Questions & Answers
# check host value regex='^(||1|2|25)(\.(||1|2|25)){3}$' if ')" != "" ]; then if ]; then echo host $host not found exit 4 fi elif ]; then echo $host is an invalid host address exit 5 fi
espeacailly the top regex part?
---------- Post updated at 06:58 PM ---------- Previous update was... (1 Reply)
Discussion started by: kevin298
1 Replies
7. Shell Programming and Scripting
Can someone, please, help me to make this condition valid/accepted in bash?
I really cannot.
I'm stuck with the brackets...
This one tells me: missing `]'
if ]; then
# NOTIFY ERROR...
fi
And... I'd also appreciate a link to bash documents that explain these things. All... (2 Replies)
Discussion started by: mamboknave
2 Replies
8. Shell Programming and Scripting
Hi everybody:
I'm working on a script to send emails with logs attached based on one single rule..."check if the number of errors has increased since the last time the script ran"
Basically what my script does is read from a previous file with the last trace of errors the previous error... (3 Replies)
Discussion started by: hyunkel_01
3 Replies
9. Shell Programming and Scripting
Hello all,
I would like to know if it is possible to return a the result of a boolean expression from a function like this
function()
{
# some code
return ||
}
and what will be the return value ?
Thank you for help. (6 Replies)
Discussion started by: dolphin06
6 Replies
10. Shell Programming and Scripting
How can I find out, that whether a regular expression are matched or not(as a boolean)?!
tnx in advance. (2 Replies)
Discussion started by: Zaxon
2 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)