Hi! I'm using
echo $string | grep "" -c
to test in a script if a string is a number and it seems to work. But how can i find, for example, if a string is a four figures number ?
Thanks to all! (2 Replies)
Okay, well this is more or less my first attempt at writing a shell script.
Anyways, here's my code:
cd ${PATH}
if
then
rm ${FILE}
./anotherScript
else
exit 1
fi
exit 1
Anyways, it's a pretty simple script that is supposed to search for the... (4 Replies)
This is the code:
while test 1 -eq 1
do
read a
$a
if test $a = stop
then
break
fi
done
I read a command on every loop an execute it.
I check if the string equals the word stop to end the loop,but it say that I gave too many arguments to test.
For example echo hello.
Now the... (1 Reply)
Hello all,
I'm trying to automate an if statement in my Perl script. The script opens an input file for reading, checks each line in the file for a particular substring, and if it finds the substring, writes it to an output file.
There are approximately 200 different input files. Each has... (3 Replies)
Hello,
I am trying to build a test statement but I can't make it work
I want to rearrange some fields, so if my "$cfg" variable contains a string ending with .log (*.log) I want to move it in another field.
Any help will be much appreciated!
Thank you
Shell:sh
if
then
log="${cfg}"... (9 Replies)
Is it possible to test against a varible within a ranges in a if statement.
ex.
if ];then
echo "not in range"
else
echo "number within range"
fi (8 Replies)
Discussion started by: leemalloy
8 Replies
LEARN ABOUT REDHAT
for
for(n) Tcl Built-In Commands for(n)
__________________________________________________________________________________________________________________________________________________NAME
for - ``For'' loop
SYNOPSIS
for start test next body
_________________________________________________________________DESCRIPTION
For is a looping command, similar in structure to the C for statement. The start, next, and body arguments must be Tcl command strings,
and test is an expression string. The for command first invokes the Tcl interpreter to execute start. Then it repeatedly evaluates test
as an expression; if the result is non-zero it invokes the Tcl interpreter on body, then invokes the Tcl interpreter on next, then repeats
the loop. The command terminates when test evaluates to 0. If a continue command is invoked within body then any remaining commands in
the current execution of body are skipped; processing continues by invoking the Tcl interpreter on next, then evaluating test, and so on.
If a break command is invoked within body or next, then the for command will return immediately. The operation of break and continue are
similar to the corresponding statements in C. For returns an empty string.
Note: test should almost always be enclosed in braces. If not, variable substitutions will be made before the for 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 $x<10:
for {set x 0} {$x<10} {incr x} {
puts "x is $x"
}
SEE ALSO
break, continue, foreach, while
KEYWORDS
for, iteration, looping
Tcl for(n)