9 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I have a project tree like that.
after running find command with the -no -empty option, i am able to have a list of non empty directory
DO_MY_SEARCH="find . -type d -not -empty -print0"
MY_EXCLUDE_DIR1=" -e NOT_IN_USE -e RTMAP -e NOT_USEFULL "
echo " " > $MY_TEMP_RESULT_1
while... (2 Replies)
Discussion started by: jcdole
2 Replies
2. News, Links, Events and Announcements
A new project was posted on your project board.
Project title: Bash Shell Tutoring
Estimated Budget:
$50/hr
Start date:
Immediately
Required skills:
Linux, Bash, Shell, UNIX
I work as a datawarehouse designer and developer.
Although I usually stick to the role of an analyst,... (0 Replies)
Discussion started by: Neo
0 Replies
3. Shell Programming and Scripting
Hello guys,
I've got a big corpus (a huge text file in which words are separated by one or several spaces). I would like to know if there is a simple way - using awk for instance - to extract any co-occurrence appearing at least 3times through the whole corpus for a given word. By co-occurrence,... (7 Replies)
Discussion started by: bobylapointe
7 Replies
4. Solaris
i have two doubts..
1. what is the use /etc/project file. i renamed this file and when i tried to switch user or login with some user account the login was happening slowly. but when i renamed it to original name it was working fine... why so?
2. unix already has useradd and grouadd for... (4 Replies)
Discussion started by: chidori
4 Replies
5. Shell Programming and Scripting
hi, sorry if this seems trivial.
i have a file url.txt which consists of a list of urls (it was supposed to be my wget -i file). however, since the server from which i am trying to download uses redirect, wget dows not remeber the filename of ther original url will save to a file name which is... (3 Replies)
Discussion started by: texttoolong
3 Replies
6. Shell Programming and Scripting
Hi,
What is the actual difference between these two? Why the following code works for process substitution and fails for command substitution?
while IFS= read -r line; do echo $line; done < <(cat file)executes successfully and display the contents of the file
But,
while IFS='\n' read -r... (3 Replies)
Discussion started by: royalibrahim
3 Replies
7. Solaris
We have a system running ssh. When a user logs in, they do not get the project they are assigned to (they run under "system"). I verify the project using the command "ps -e -o user,pid,ppid,args,project". If you do a "su - username", the user does get the project they are assigned to (and all... (2 Replies)
Discussion started by: kurgan
2 Replies
8. Shell Programming and Scripting
hi,
in a text file i want to find the lines
which contains A and B,and if these lines do not contain C and D.
i want to substitute X with Y.
how can i achive these?
i tried with sed and awk, but couldnt succeed. (3 Replies)
Discussion started by: yakari
3 Replies
9. UNIX for Dummies Questions & Answers
The auditors have nailed us for world writeable files....
Apparently in years gone by, quite a number of our kornshell scripts have had:
umask 000 put in the script.
We have been able to turn off world writeable for existing dirs & files, but as these scripts run, new files keep getting... (1 Reply)
Discussion started by: kornshellmaven
1 Replies
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 -s 200
# ... commands executed under lock ...
) 200>/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 hold ing 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-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
flock utility 4 Feb 2006 FLOCK(1)
