Ouch :-) Allthough the first expression ist true, both the "then" and the "else" part of the sequence is executed, because the "then" part evaluates to false.
Absolutely. This might circumvent the trap (not sure if it opens others):
Ok heres the situation,
We use Solaris 8 at work with Sybase for the db. I need to be able to easily create visual diagrams of some of our more complex systems. I've been using Visio which is such a manual process and takes a while.
I was thinking maybe using Visio somehow in conjunction... (0 Replies)
We have a unix file that contains special characters (ie. Ñ, °, É, ¿ , £ , ø ). When I try to read this file I get a codepage error and the characters are replaced by the # symbol. How do I keep the special characters from being read?
Thanks.
Ryan (3 Replies)
Hi,
I am writing a Perl script that reads in many lines, if a line meets the criteria I want to edit, it. For example, the script will return the following example line... test=abc123
All I want to do is strip off the "test=" and just be left with the abc123. In my script I can easily... (3 Replies)
All I'm trying to split a string at the $ into arrays
@data:=<dataFile>
a $3.33
b $4.44
dfg $0.56
The split command I have been playing with is:
split(/\$/, @data)
which results with
a .33 b .44 dfg .56
any help with this is appreciated
/r
Rick (9 Replies)
Hi,
I have field in a file which would come with any special character, how do i check that field?
Eg: @123TYtaasa>>>/ 131dfetr_~2
In the above example, how do I add pattern for any special character on the keyboard.
Thanks (3 Replies)
Hi all
i have been trying to do a small 'question and answer' script using if-else statement and a combination of pipe. I have succeeded in allowing the user to login with user name and password stored in a sequence username/password in a file named "pass" like this:
echo "please enter your... (14 Replies)
Hi, I'm looking for information about UNIX Special Files. I must write an essay connected with this topic, and I hope you'll tell me where can I found trusty information about it, because Google doesn't really help me. I'll be grateful for answer. (3 Replies)
I have a file that has the name in one of the lines as MARíA MENDOZA in Windows. When this gets FTPed over to UNIX it appears as MAR�A MENDOZA. Is there anyway to overcome this? Its causing a issue because the file is Postional and fields are getting pushed by 2 digits..
Any help would be... (4 Replies)
Any time I do :
ls *.txt > mytext.txt
I get something like this in the output file:
^
Tue Jan 22 16:19:19 EST 2013 x86_64 x86_64 x86_64 GNU/Linux
t1Fam_BrOv :~>alias | grep ls
alias l.='ls -d .* --color=tty'
alias lR='ls -R'
alias la='ls -Al'
alias lc='ls -ltcr'
alias ldd='ls -ltr |... (5 Replies)
Discussion started by: genehunter
5 Replies
LEARN ABOUT CENTOS
if
if(n) Tcl Built-In Commands if(n)
__________________________________________________________________________________________________________________________________________________NAME
if - Execute scripts conditionally
SYNOPSIS
if expr1 ?then? body1 elseif expr2 ?then? body2 elseif ... ?else? ?bodyN?
_________________________________________________________________DESCRIPTION
The if command evaluates expr1 as an expression (in the same way that expr evaluates its argument). The value of the expression must be a
boolean (a numeric value, where 0 is false and anything is true, or a string value such as true or yes for true and false or no for false);
if it is true then body1 is executed by passing it to the Tcl interpreter. Otherwise expr2 is evaluated as an expression and if it is true
then body2 is executed, and so on. If none of the expressions evaluates to true then bodyN is executed. The then and else arguments are
optional "noise words" to make the command easier to read. There may be any number of elseif clauses, including zero. BodyN may also be
omitted as long as else is omitted too. The return value from the command is the result of the body script that was executed, or an empty
string if none of the expressions was non-zero and there was no bodyN.
EXAMPLES
A simple conditional:
if {$vbl == 1} { puts "vbl is one" }
With an else-clause:
if {$vbl == 1} {
puts "vbl is one"
} else {
puts "vbl is not one"
}
With an elseif-clause too:
if {$vbl == 1} {
puts "vbl is one"
} elseif {$vbl == 2} {
puts "vbl is two"
} else {
puts "vbl is not one or two"
}
Remember, expressions can be multi-line, but in that case it can be a good idea to use the optional then keyword for clarity:
if {
$vbl == 1 || $vbl == 2 || $vbl == 3
} then {
puts "vbl is one, two or three"
}
SEE ALSO
expr(n), for(n), foreach(n)
KEYWORDS
boolean, conditional, else, false, if, true
Tcl if(n)