hi friends,
i'm new to shell scripting,can i know how to change the environment variables without altering anythng in .bash_profile as the change in it is for a specific user but i want the change to be available to every user who logs in.
bye. (1 Reply)
hey guys. i'm new to shell scripting but not new to programming. i want to write a script that will take all the files in the current directory that end with a particular filetype and change all their names to a number in order. so, it would take all the jpg files and sort them in alphabetical... (30 Replies)
In FORMAT->ANALYZE->SETUP there's a couple variables you can set for the various functions. However, everytime I exit format it reverts back to the defaults. Is there a file I can edit somewhere to change these default settings? (0 Replies)
Sorry for such a dreadful title, but I'm not sure how to be more descriptive. I'm hoping some of the more gurutastic out there can take a look at a solution I came up with to a problem, and advice if there are better ways to have gone about it.
To make a long story short around 20K pieces of... (2 Replies)
I'm trying to understand if it's possible to create a set of variables that are numbered based on another variable (using eval) in a loop, and then call on it before the loop ends.
As an example I've written a script called question (The fist command is to show what is the contents of the... (2 Replies)
Hi,
I need help on for loop need to add domain and IP
In domain list
1.com
2.com
3.com
In Ip list
1.1.0.1
1.2.0.1
1.3.0.1
1.com 1.1.0.1
2.com 1.2.0.1
3.com 1.3.0.1
I need to excute this command (4 Replies)
Hi All please help if possible. I am a Unix novice. I have a similar question to the one posted by yonderboy at about a year ago. However his solution does not work for me.
The pseudo code for my problem is as follows:
for fund in 1 2 3 4
if (FTP is successfully) then
FILE_SENT_fund... (2 Replies)
Hi,
I would like to write a loop to change the names of files in a directory. The files are called data1.txt through data1000.txt. I'd like to change their names to a1.txt through a1000.txt. How do I go about doing that? Thanks! (2 Replies)
#!/bin/bash
X=$(</home/cogiz/computerhand.txt) # (3S 8C 2H 6D QC 8S 4H 5H)
Y=$(</home/cogiz/topcardinplay.txt) # KS
A=( "${Y::1}" )
B=( "${Y:1}" )
for e in ${X}; do
if ]; then # searching for valid cards K,S or 8
... (0 Replies)
Discussion started by: cogiz
0 Replies
LEARN ABOUT CENTOS
for
for(n) Tcl Built-In Commands for(n)
__________________________________________________________________________________________________________________________________________________NAME
for - 'For' loop
SYNOPSIS
for start test next body
_________________________________________________________________DESCRIPTION
For is a looping command, similar in structure to the C for statement. The start, next, and body arguments must be Tcl command strings,
and test is an expression string. The for command first invokes the Tcl interpreter to execute start. Then it repeatedly evaluates test
as an expression; if the result is non-zero it invokes the Tcl interpreter on body, then invokes the Tcl interpreter on next, then repeats
the loop. The command terminates when test evaluates to 0. If a continue command is invoked within body then any remaining commands in
the current execution of body are skipped; processing continues by invoking the Tcl interpreter on next, then evaluating test, and so on.
If a break command is invoked within body or next, then the for command will return immediately. The operation of break and continue are
similar to the corresponding statements in C. For returns an empty string.
Note: test should almost always be enclosed in braces. If not, variable substitutions will be made before the for command starts execut-
ing, which means that variable changes made by the loop body will not be considered in the expression. This is likely to result in an
infinite loop. If test is enclosed in braces, variable substitutions are delayed until the expression is evaluated (before each loop iter-
ation), so changes in the variables will be visible. See below for an example:
EXAMPLES
Print a line for each of the integers from 0 to 10:
for {set x 0} {$x<10} {incr x} {
puts "x is $x"
}
Either loop infinitely or not at all because the expression being evaluated is actually the constant, or even generate an error! The
actual behaviour will depend on whether the variable x exists before the for command is run and whether its value is a value that is less
than or greater than/equal to ten, and this is because the expression will be substituted before the for command is executed.
for {set x 0} $x<10 {incr x} {
puts "x is $x"
}
Print out the powers of two from 1 to 1024:
for {set x 1} {$x<=1024} {set x [expr {$x * 2}]} {
puts "x is $x"
}
SEE ALSO
break, continue, foreach, while
KEYWORDS
for, iteration, looping
Tcl for(n)