I am not able to read inside a while though i get the message "inside read" the cursor doesnt prompt from the console
Code:
cat file | while read ln_new_engine_dirs
do
echo "inside $ln_new_engine_dirs"
if [ "$ln_new_engine_dirs" != "" ]
then
read nn
echo "inside read"
fi
done
You are reading from the standard input which is coming from file. You need to read from the terminal, e.g.:
UNIX Sun Ultra60 5.5.1
Hello everybody, I have a problem that seems simple but turns out to be complex (for me at least). My program needs to open a directory (this part is easy), scan each filename and determine whether or not a file with the suffix (.07) exists. So the program would return... (5 Replies)
i have a teat file having data like
one 12/3
two 23/09
three 12/12
now from another script i want to read one line at a time ,cut field one and two in two separate variable ,compare field1 with another variable
but outside the loop .If i found a match i want to take from user the value... (2 Replies)
Hi I am trying read in side a do statement
but it is not working it is just printing abc before read but not stopping in abc for user input
Can anybody please help
#!/usr/bin/ksh
cat sample_file | while read ln_source3
do
param=`echo $ln_source3 | nawk... (1 Reply)
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)
I know I should be able to see a way of doing this easily, but my brain just won't engage.
I have a script working on an embedded device that checks to see if an item is in a blacklist before performing some actions.
At the moment the code reads thus....
while read BLACKLIST ; do
... (7 Replies)
Hi all
Sorry for the basic question, but i am writing a shell script to get around a slightly flaky binary that ships with one of our servers. This particular utility randomly generates the correct information and could work first time or may work on the 12th or 100th attempt etc !.... (4 Replies)
Learning, stumbling! My progress in shell scripting is slow. Now I have this doubt:
I have the following file (users.txt):
AU0909,on
AU0309,off
AU0209,on
AU0109,off
And this file (userson.txt)
AU0909
AU0209
AU0109
AU0309
I just want to set those users on userson.txt to "off" in... (14 Replies)
I'm taking a unix class and need to countdown to 0 from whatever number the user inputs. I know how to do this with a while or until loop but using the for loop is throwing me off....
I know I can use an if-then statement in my for loop but can I include a while loop in my for loop? (3 Replies)
Hello,
I'm using RHEL 5.1 with bash. How to handle "read" inside while loop reading every line? Please see below:
# cat /tmp/passwd_sample
CARRJ12:qVSn4ja4mFA72,..:20021:125:JULIAN CARR:/home/everyone:/bin/bash
HERCOT01:NK/3j2ZB4ZC7Q:20022:125:TOM HERCOCK:/home/everyone:/bin/bash... (4 Replies)
Hi Team,
Not getting the file output inside my email which i am sending from unix box. . Please refer the below code :
#!/bin/sh
{
sleep 5
echo ehlo 10.56.185.13
sleep 3
echo mail from: oraairtel@CNDBMUREAPZP02.localdomain
sleep 3
echo rcpt to: saurabhtripathi@anniksystems.com... (1 Reply)
Discussion started by: tripathi1990
1 Replies
LEARN ABOUT CENTOS
while
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
}
EXAMPLE
Read lines from a channel until we get to the end of the stream, and print them out with a line-number prepended:
set lineCount 0
while {[gets $chan line] >= 0} {
puts "[incr lineCount]: $line"
}
SEE ALSO
break(n), continue(n), for(n), foreach(n)
KEYWORDS
boolean value, loop, test, while
Tcl while(n)