hi guys i'm helping out as a lab assistant and have been told to use a linux shell script to gather assignments from the students in the class I'm helping out in. They've been told to have their assignment in a certain folder in their accounts and I'm to gather them, only problem is I don't don't know how and don't want to seem a total fool to the lecturer I'm helping!
Any help would be appreciated!
hi guys.
I have an Kaon router wich runs "Linux version 3.10.24-svn1480 (jskim@jake-205) (gcc version 4.4.7 (Realtek MSDK-4.4.7 Build 1459".
The problem I have it is that its firmware is in early stages and has alot of things messed up.
Wake on lan doesn't work without arp binding and that can... (23 Replies)
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)
Hi guys , I m new to linux and would like to buy some quality video tutorials .
Request you to guide me any good source for programming(C,Java,VB) or linux tutorials.
Tutorials should be known and good like lynda.com (5 Replies)
hi everyone,
Can anyone guide me with:
How to start with the solaris, as i m new to this.
(any material or any link or any start up book)
Plz do needful as soon as possible..
Thanks.
Hitesh T. (2 Replies)
I have a problem
I got about 50 log files with some information, the info is not important. I would like to search only for specific info from the logs. I did find it. But i cannot see from where it comes
can you help me
I have used :
cat *.log | grep "??????", but the log file too.
Thanks... (3 Replies)
This may not be the right forum to put up a question like the one I'm about to ask. I am hoping that I would get very fruitful responses.
i) I have been learning UNIX for sometime now, but my question is realistically what do I need to be able to be able to apply for UNIX jobs.
What sort of... (6 Replies)
I have got Sun Fire V120 for testing( just trying to install Solaris 10 on it).
Just need to know how shall I get display on my normal monitor as I cannot see any compatible port??
Regards, (1 Reply)
FLOCK(1) User Commands 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 || exit 1
# ... 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/.
util-linux February 2006 FLOCK(1)