10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
guys im new here and i need help with some linux commands.
filea has keyword on each line
identity
aaa
bbb
ccc
i have following commands.
egrep 'www.identity' ~/home/m3 >~/home/lopo2
wc -l file ~/home/lopo2
say lopo2 has 44 lines
then output saved is
identity 44 (1 Reply)
Discussion started by: ahfze
1 Replies
2. UNIX for Advanced & Expert Users
HI,
My requirement as below
Log with Error
Starting FeedRunner for feed: 200 Product example Items
Error FeedRunner for feed: 200 Product example Items
Stopping FeedRunner for feed : 200 Product example Items Feed time taken 231743
Log without Error
Starting... (0 Replies)
Discussion started by: Paulwintech
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3. Post Here to Contact Site Administrators and Moderators
Hi Neo
I am working on Red Had Linux from last 3 yrs on basic level.
I want to do the UNIX admin certification ASAP.
Please suggest.........Which is the most demanding flavor in market & remain demanding in future as well ???
Waiting for your early response.
Thanks
Tushar Joshi (1 Reply)
Discussion started by: tusharjoshi
1 Replies
4. UNIX for Dummies Questions & Answers
I developed the following in LINUX:
cat monica.txt | sed 's/;;;/\n;;;/g'> fixed.txt
csplit -f comment -n 4 fixed.txt '/;;;/' {*}
Basically, I want it to take the file monica.txt and put every instance of ;;; on a new line and put it in fixed.txt, then split fixed.txt at every instance of ;;;... (13 Replies)
Discussion started by: mschpers
13 Replies
5. Linux
Hi All,
Can anyone tell me the difference between flavour & distribution?
As we say that - AIX, Linux, Solaris etc are the flavours of Unix & fedora, ubuntu, suse etc are the distributions of linux.
Can anyone explain me, why it is called so.
Thanks in advance.
Amol (6 Replies)
Discussion started by: Amol21
6 Replies
6. Shell Programming and Scripting
Hi all,
Everyday I used to parse the Catalina.out log file on my Redhat system for errors for a particular date. Could anybody be able to help me to create a command which can grep the contents of Catalina.out starting from particular date.
Please do not suggest command which greps only the... (12 Replies)
Discussion started by: redhatperl
12 Replies
7. Shell Programming and Scripting
Hi,
A newbie question.
Following script gives no output.
===============================
root@srv # cat /etc/redhat-release | awk {'print $1}'
Red
root@srv # cat 123.sh
if (( `cat /etc/redhat-release | awk {'print $1}'` != CentOS )); then { echo "System runs on Redhat Linux. ... (13 Replies)
Discussion started by: fed.linuxgossip
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8. UNIX for Advanced & Expert Users
Hai Friends
I am writing a client-server application for backup utility. The computer is used only for backup utility. We have planed to place linux operating system in it. But i am confused with lots of falvour. I don't know really which flavour of linux to use. Can you please suggest me a... (2 Replies)
Discussion started by: collins
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9. OS X (Apple)
I'm quite interested in resusing an old bondi iMac i have as a unix box, and i was wondering what distro people would recomend.
I had thought of using BSD/FreeBSD cos thats what osx is based on. I'm doing this as a teaching excercise (for myself) so i'm looking for something achievable rather than... (9 Replies)
Discussion started by: ora
9 Replies
10. UNIX for Dummies Questions & Answers
Hi folks,
First post so be gentle with me :) I've decided it's about time I got down and dirty with Unix, so have jumped in at the deep end and am downloading Redhat as an option to Win2000 on my Intel machine. Should be fun (!), but if I remember right there's options of which type of... (2 Replies)
Discussion started by: clanger
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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)