Greetings all,
I'm currently writing a shell script menu which is dynamically populated from an array. Have a question to ask about the filtering of invalid input. I'm using KSH.
A brief description of my algorithm is as follows:
1) Read in input from user and store in a variable. (a valid... (2 Replies)
I want to write a script in KSH that takes the output of one command and redisplays it. Something like:
while true
do
read inpt
date +"%I:%M:%S %p <-> $inpt"
done
and then some how get the output of the ping command to redirect to the input of this script.
does that make sense? (2 Replies)
Hi,
I need help in unziping input file through shell script.
I had written script, which checks for input file extention.
If Extension is "zip" or "gz", then I want to do unzip/uncompress that file.
Caould you please let me know that, How to unzip a file through shell script (ksh).
Thanks... (16 Replies)
how to wrote a script that reads an input from the reader (dir name) and then answer yes to all questions in the script unless the answer to any of the questions contains a certain string?
example:
$] script.sh dir_name
$] question_1: (answer should be y right after the question is echoed,... (3 Replies)
Hi
I am stucked in the below script .I want to input with yes/no from the user and then execute the code inside if but it is not working .I just need the logic as where I am wrong so that i can use the same in my work .
then
echo "Hi All"
fi
].
Please suugest . (4 Replies)
Hello,
Is ther any way to run a loop which promt an echo"waiting for user to hit ENTER"
sleeps for an iterval and once user hit the ENTER key the loop exit and the script continue to the next stage?
I need this ASAP !!!
Thanks!! (9 Replies)
HI
i have written a script to ask input from the user.
this script should promote the user for y/n input. if user enters anyother input then y/n
the script promotes him again. this below code is working fine for all the cases.
except for space and enter " if i give space and enter it is... (2 Replies)
have three big data file, however I just need to see the mentioned below one line form the all the file which has SERVER_CONNECTION Value
File 1
export SERVER_CONNECTION=//dvlna002:10001/SmartServer
File2
export SERVER_CONNECTION=///SmartServer
File3
export... (1 Reply)
I am looking for a way to start a script and have it prompt for a password that will be used later on in the script to SSH to another host and to SFTP. I don't want the password to be hard coded. Below is my script with the actual IP's and usernames removed.
#!/usr/bin/expect -f... (2 Replies)
Hi,
This is a script which to create an opvn user, I want which answer automatically to a certain part so, I try this, it works without the red part but I must type manually.. :
#!/bin/bash
## Environnement ##
LC_ALL=C
## Paths ##
rsa_dir="etc/openvpn/easy-rsa"... (10 Replies)
Discussion started by: Arnaudh78
10 Replies
LEARN ABOUT LINUX
flock
FLOCK(1) H. Peter Anvin FLOCK(1)NAME
flock - Manage locks from shell scripts
SYNOPSIS
flock [-sxon] [-w timeout] lockfile [-c] command...
flock [-sxon] [-w timeout] lockdir [-c] command...
flock [-sxun] [-w timeout] fd
DESCRIPTION
This utility manages flock(2) locks from within shell scripts or the command line.
The first and second forms wraps the lock around the executing a command, in a manner similar to su(1) or newgrp(1). It locks a specified
file or directory, which is created (assuming appropriate permissions), if it does not already exist.
The third form is convenient inside shell scripts, and is usually used the following manner:
(
flock -n 9
# ... commands executed under lock ...
) 9>/var/lock/mylockfile
The mode used to open the file doesn't matter to flock; using > or >> allows the lockfile to be created if it does not already exist, how-
ever, write permission is required; using < requires that the file already exists but only read permission is required.
By default, if the lock cannot be immediately acquired, flock waits until the lock is available.
OPTIONS -s, --shared
Obtain a shared lock, sometimes called a read lock.
-x, -e, --exclusive
Obtain an exclusive lock, sometimes called a write lock. This is the default.
-u, --unlock
Drop a lock. This is usually not required, since a lock is automatically dropped when the file is closed. However, it may be
required in special cases, for example if the enclosed command group may have forked a background process which should not be hold-
ing the lock.
-n, --nb, --nonblock
Fail (with an exit code of 1) rather than wait if the lock cannot be immediately acquired.
-w, --wait, --timeout seconds
Fail (with an exit code of 1) if the lock cannot be acquired within seconds seconds. Decimal fractional values are allowed.
-o, --close
Close the file descriptor on which the lock is held before executing command. This is useful if command spawns a child process
which should not be holding the lock.
-c, --command command
Pass a single command to the shell with -c.
-h, --help
Print a help message.
AUTHOR
Written by H. Peter Anvin <hpa@zytor.com>.
COPYRIGHT
Copyright (C) 2003-2006 H. Peter Anvin.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
SEE ALSO flock(2)AVAILABILITY
The flock command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
flock utility 4 Feb 2006 FLOCK(1)