Hi Good people :D
How do I check if a directory exists, if it does then carry on rest of the script, otherwise exit.
-------------
cd $mainfolder/system1
#unzips files arrived in last 24 hrs into temp directory
find * -mmin -1440 -exec unzip {} \;
I'd like to check here if temp... (2 Replies)
Hi folks!
First off I'm working with a Sybase DB.
I'm using you're basic ISQL command to connect to my Sybase DB...
isql -S$DB_SERVER -D$DB_NAME -U$DB_USR -P$DB_PWD <<!EOF > $log_file
My question is, is there a way to determine if a database exists using shell script?
For example, if... (2 Replies)
Hi. I'd like to have an IF-Then-Else statement where I can check to see if a file exists? We have the Bourne Shell by default. I'm looking for the syntax to do something like this:
if myfile.txt exists then
...my code
else
...my code
end if
Any help would be greatly... (5 Replies)
i writing a program that checks if any .txt files exist in the current directory if it does, then it lists the files...
i have got everything right, except the validation part doesnt work!
....
if
then
ls *.txt
else
echo "file not found"
everytime it tells me file not found!!
by... (3 Replies)
Hi
#Testing for file existence
if ; then
echo 'SCHOOL data is available for processing'
else
echo 'SCHOOL DATA IS NOT AVAILABLE FOR PROCESSING'
:
i wrote a script, where it begins by checking if file exists or not.
If it exists, it truncates the database... (2 Replies)
Hello,
May i please know how do i check if the given input argument is one of the listed numbers then success else failure. I am using bash shell.
if
then
echo "success"
else
echo "failure"
fi
Thank you. (2 Replies)
Hi,
I need to check if the URL exists.
Below is my OS:
SunOS mymac1 Generic_148888-04 sun4v sparc SUNW,SPARC-Enterprise-T5220
I do not have the curl set in the profile nor am i aware about its path.
But i have wget. Please help me with params for the same.
Can you help me check if... (6 Replies)
Hi,
I want to check if the file exists or not in the directory.
i am trying below code but not working.
File="/home/va59657/Account_20090213*.dat"
echo "$File"
if ]; then
echo "file found"
else
echo "file not found"
fi
However i am getting file not found even if file exits as... (5 Replies)
Hi,
I have the below code written. However I am not getting the desired output
I am checking if the particular path has file in it.
#!/bin/bash
ls -l /IRS2/IRS2_ODI/INFILE/*LS* 1>/dev/null 2>/dev/null
if
then
echo $?
echo "File Exists"
fi
... (3 Replies)
I need to check whether a file exists and has been changed.
The file should contain a specific string. The file should also have been changed within the last ten seconds.
How do I do that? (3 Replies)
Discussion started by: locoroco
3 Replies
LEARN ABOUT NETBSD
shlock
SHLOCK(1) BSD General Commands Manual SHLOCK(1)NAME
shlock -- create or verify a lock file for shell scripts
SYNOPSIS
shlock [-du] [-p PID] -f lockfile
DESCRIPTION
The shlock command can create or verify a lock file on behalf of a shell or other script program. When it attempts to create a lock file, if
one already exists, shlock verifies that it is or is not valid. If valid, shlock will exit with a non-zero exit code. If invalid, shlock
will remove the lock file, and create a new one.
shlock uses the link(2) system call to make the final target lock file, which is an atomic operation (i.e. "dot locking", so named for this
mechanism's original use for locking system mailboxes). It puts the process ID ("PID") from the command line into the requested lock file.
shlock verifies that an extant lock file is still valid by using kill(2) with a zero signal to check for the existence of the process that
holds the lock.
The -d option causes shlock to be verbose about what it is doing.
The -f argument with lockfile is always required.
The -p option with PID is given when the program is to create a lock file; when absent, shlock will simply check for the validity of the lock
file.
The -u option causes shlock to read and write the PID as a binary pid_t, instead of as ASCII, to be compatible with the locks created by
UUCP.
EXIT STATUS
A zero exit code indicates a valid lock file.
EXAMPLES
BOURNE SHELL
#!/bin/sh
lckfile=/tmp/foo.lock
if shlock -f ${lckfile} -p $$
then
# do what required the lock
rm ${lckfile}
else
echo Lock ${lckfile} already held by `cat ${lckfile}`
fi
C SHELL
#!/bin/csh -f
set lckfile=/tmp/foo.lock
shlock -f ${lckfile} -p $$
if ($status == 0) then
# do what required the lock
rm ${lckfile}
else
echo Lock ${lckfile} already held by `cat ${lckfile}`
endif
The examples assume that the file system where the lock file is to be created is writable by the user, and has space available.
HISTORY
shlock was written for the first Network News Transfer Protocol (NNTP) software distribution, released in March 1986. The algorithm was sug-
gested by Peter Honeyman, from work he did on HoneyDanBer UUCP.
AUTHORS
Erik E. Fair <fair@clock.org>
BUGS
Does not work on NFS or other network file system on different systems because the disparate systems have disjoint PID spaces.
Cannot handle the case where a lock file was not deleted, the process that created it has exited, and the system has created a new process
with the same PID as in the dead lock file. The lock file will appear to be valid even though the process is unrelated to the one that cre-
ated the lock in the first place. Always remove your lock files after you're done.
BSD June 29, 1997 BSD