03-08-2013
9 More Discussions You Might Find Interesting
1. Red Hat
Hello all,
If anyone has time, I have a few questions:
How do I do the following in Linux. We are using Red Hat and Oracle Enterprise Linux, which is based on Red Hat too.
1. How to lock the account after a few (like 3) invalid password attempts?
2. How do you lock a screen after 30... (1 Reply)
Discussion started by: nstarz
1 Replies
2. Shell Programming and Scripting
Hi,
I'm trying to use sed within a shell script (bash, running ubuntu). The command works fine from the command line, but when I use it within the script, rather than creating a file with the name I've specified, it creates one that ends with a question mark '?' when you use ls, e.g.... (3 Replies)
Discussion started by: jennykay
3 Replies
3. Shell Programming and Scripting
I have a script that runs ditto for me, and occasionally (if I exit the script while ditto is running in the background) it will leave an empty file named 0 in the script's directory. The next time I run the script, it generates incorrect data because of this file. I know I can easily insert a... (1 Reply)
Discussion started by: reid
1 Replies
4. Shell Programming and Scripting
I have a script that runs ditto for me, and occasionally (if I exit the script while ditto is running in the background) it will leave an empty file named 0 in the script's directory. The next time I run the script, it generates incorrect data because of this file. I know I can easily insert a... (1 Reply)
Discussion started by: reid
1 Replies
5. UNIX for Advanced & Expert Users
Hi all,
I have to test some user priviliges. The goal is to be sure that an unauthorized user can't restart some modules (ssh, mysql etc...).
I'm trying to automate it with a shell script but in same cases I got the syslog broadcast message.
Is there any way to simply get a return code... (3 Replies)
Discussion started by: Dedalus
3 Replies
6. UNIX for Dummies Questions & Answers
I'm using a script that does some modifications to data on disc and updates the database. The script (perl) uses STDOUT so the results are printed to the screen. I don't have permissions to modify the script. I want to capture the results in a file so I can see if errors occurred and also keep... (3 Replies)
Discussion started by: surib
3 Replies
7. Shell Programming and Scripting
I am new to Linux. Using latest version of Ubuntu.
I want to make a script that creates a 1GB file filled with zeros using dd and then formats the file as vfat with a label of "MYFILE".
If anyone can help me it would be appreciated. (9 Replies)
Discussion started by: paviter619
9 Replies
8. Red Hat
Hi,
I have created a test script like this :
# cat script1.sh
DAY=$(date +%d)
MONTH=$(date +%b)
YEAR=$(date +%Y)
BC01="Blast_BC01"
BC15="Blast_BC15"
DIR1="$MONTH$YEAR_$BC01"
DIR2="$MONTH$YEAR_$BC07"
DIR3="$MONTH$YEAR_$BC15"
if ;then
mkdir -p "$YEAR/$DIR3"
fi
#
When I... (5 Replies)
Discussion started by: anaigini45
5 Replies
9. Shell Programming and Scripting
I am new to Linux. Using latest version of Ubuntu.
I want to make a script that creates a 1GB file filled with zeros using dd and then formats the file as vfat with a label of "MYFILE".
If anyone can help me it would be appreciated. (1 Reply)
Discussion started by: amandasaza08
1 Replies
plock(2) System Calls Manual plock(2)
Name
plock - lock or unlock process, text, or data in memory
Syntax
#include <sys/lock.h>
int plock (op)
int op;
Description
The call allows the calling process to lock its text segment (text lock), its data segment (data lock), or both its text and data segments
(process lock) into memory. Locked segments are immune to page outs, and the process is immune to swap outs. The call also unlocks these
segments.
The op argument specifies the following:
PROCLOCK Lock text and data segments into memory (process lock)
TXTLOCK Lock text segment into memory (text lock)
DATLOCK Lock data segment into memory (data lock)
UNLOCK Remove locks
Return Values
Upon successful completion, a value of 0 is returned to the calling process. Otherwise, a value of -1 is returned, and errno is set to
indicate the error.
Diagnostics
The call fails under the following conditions:
[EPERM] The effective user ID of the calling process is not superuser.
[EINVAL] The op argument is equal to PROCLOCK, and a process lock, a text lock, or a data lock already exists on the calling process.
[EINVAL] The op argument is equal to TXTLOCK, and a text lock or a process lock already exists on the calling process.
[EINVAL] The op argument is equal to DATLOCK, and a data lock or a process lock already exists on the calling process.
[EINVAL] The op argument is equal to UNLOCK, and no type of lock exists on the calling process.
Restrictions
The effective user ID of the calling process must be superuser to use this call.
Both PROCLOCK and TXTLOCK lock the text segment of a process, and a locked text segment is locked for all sharing processes.
Because the effective user ID of the calling process is superuser, take care not to lock more virtual pages than can be contained in physi-
cal memory. A deadlock can result.
See Also
execve(2), exit(2), fork(2), shmctl(2)
plock(2)