Please find my exact requirement and answers for your questions.
Instead of showing us examples of lines from your input file, please describe in English the format of the filenames in that file:
User will be provided the file names in the input.txt file and the file name with "ADUS" need to be check whether it is exist in /retail/market/salil directory and the file name with "PROM" need to be checked whether it is present in /retail/market/loki directory.
How many (period separated) fields can there be in your filenames?
5 field separtor in PROM file and 4 field separator in ADUS file.
Is the 2nd field (the string between the 1st and 2nd periods in the filename) always the week number?
In PROD and ADUS file it differs.
Is the last field always the field that contains ADUS or PROM (or none of the above)?
yes last file contains ADUS or PROM.
Can any field other than the last field be empty (i.e., in addition to HTS40007.W1978.
Last field might be empty sometimes.
could there be a filename like HTS40006.W1978..PROM )?
no i have wrongly provided.
I am writing a script that will identify the oldest file in a directory. Here's the syntax:
#!/bin/ksh
cd directory
chmod 777 *
ls -r -1t > file1
sed -n -e "1P" < file1 > file2
So my problem is, now I have file2, which contains the name of the oldest file in the directory. How do I use,... (1 Reply)
This script searches for core files and if it finds one, it emails me to let me know.I DONT want it to email me if it doesn't find one but I can't figure out what I need to change or add. Any thoughts? Script below:
/bin/find / -name core -type f -ls -exec file {} \;|/usr/bin/mailx -s... (1 Reply)
Hello
I am working on cleaning up permissions on Oracle mountpoints and datafiles in unix. I am looking for a script or a scripting idea to 1st.
1. grep for owner oracle
2. ensure its a directory owned for oracle
3. chmod 750 on the oracle owned directory.
4. grep for oracle files, etc... (3 Replies)
I'm new to shell scripting and am having a problem trying to do something in C shell. I want to write a script that will input something instead of a user doing it. For example, using the command 'write' the user is supposed to type something to be sent to another user. I want a script to be able... (3 Replies)
I am writing a backup script for AIX 5 and running into a problem where the output isn't being shown in the output log that is being created. Any ideas on how this would be corrected? I have included the script below. The only thing showing up in the file is listed below. I was hoping to capture... (2 Replies)
I'm writing a small script that will run an executable program (sort of like TOP). To exit the executable, you have to enter control C (^c). I'm trying to use a redirect input file to send the ^c but I'm not having any luck. My short script looks like this - /mydirectory/abc.script < abc.in >... (1 Reply)
Folks;
I'm writing a shell script to extract some fields out of a log file & it will run periodically, how can i make it runs starting from where it left of. for example;
if the script will do the extract every 2 days, let's say the first run will extract fields until July 25, 2007 @ 11:15:22... (1 Reply)
folks;
I have a script to remove any files that older than 14 days then move any files that younger than 7 days to another directory. but for some reason it doesn't move the files, when i do it manually it works but not through the script. i tried 2 different ways in writing the move part but it... (6 Replies)
Preview of command prompt
f ---> to start ferret
q----> to stop ferret
asp@nex:~$ f
NOAA/PMEL TMAP
FERRET v6.82
Linux 2.6.18-308.8.2.el5PAE 32-bit - 08/03/12
3-Dec-12 16:44
yes? go my.jnl
yes?column=4/skip=1/type=num,text ............filename.txt
---... (4 Replies)
Hi
I am trying to write a small script which takes one by one file name from a txt file and do a 'll' and need to check if equal to the given month, otherwise it should return back the file name.
Note: the file name contains parameter.
My code is given below: It is not working .. giving error... (6 Replies)
Discussion started by: Ravindra Swan
6 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)