Sponsored Content
Top Forums Shell Programming and Scripting Verify File exists and execute command Post 302499560 by CKT_newbie88 on Thursday 24th of February 2011 04:36:20 PM
Old 02-24-2011
Verify File exists and execute command

Hi,

I am trying to verify that a file exists within an alternate directory. If the file exists, it will execute a copy command...if it does not, it should exit the script.

I tried the <test> command and the [ -f $filename] but keep coming up with syntax errors.

I am coding in C Shell and the file name is actually a $variable.

basically, I have:

Code:
test -f /alt/dir/$filename
 
if ($#status == 0) then <cp...>
else echo "does not exist"
endif
exit

Thanks!

Last edited by radoulov; 02-24-2011 at 05:51 PM.. Reason: Code tags, please!
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

verify if a process exists (ps)

hi I want to verify that a process exists. if the process exists, then it means the service is up. ps -ef | grep monito returns an entry if the service is up. how to translate that in a shell script?? many thanks (4 Replies)
Discussion started by: melanie_pfefer
4 Replies

2. Shell Programming and Scripting

Monitor log file and execute command

I would like to monitor a log file using a shell script and as soon as a line with a certain string in it appears I would like to run a program. I have been playing around with doing this using tail -f, but cannot get it to work. I found something similar here:... (1 Reply)
Discussion started by: danielsbrewer
1 Replies

3. HP-UX

How to execute a remote file with local command

Hello, I know this is somewhat strange, but please let me know if possible. I want to execute a program file in the remote machine with command on the local machine. Let me make things more clear. Suppose I have a cc on my local system and do not have that on the remote system. I want to use... (2 Replies)
Discussion started by: Veera_Raghav
2 Replies

4. Programming

Assign a command to execute a file

Hi all, I want to assign a command name to a file.e.g. suppose I have a .sh file "xyz.sh". I want to execute the file by typing in "abc". The desired output is: $ abc should execute the "xyz.sh" file. Kind Regards, Qasim (4 Replies)
Discussion started by: qasim
4 Replies

5. Shell Programming and Scripting

Take the value of variable from a file and execute a command for each value

Hello Experts, I would like to know the best way to assign a value to variable from a given file and execute a command including this variable for each entry from the file. to be more clear, i have a file with different lines (each line with a different value). i want to substitute the variable... (2 Replies)
Discussion started by: Dendany83
2 Replies

6. Shell Programming and Scripting

find specific file names and execute a command depending on file's name

Hi, As a newbie, I'm desperate ro make my shell script work. I'd like a script which checks all the files in a directory, check the file name, if the file name ends with "extracted", store it in a variable, if it has a suffix of ".roi" stores in another variable. I'm going to use these two... (3 Replies)
Discussion started by: armando110
3 Replies

7. Shell Programming and Scripting

Find a file and if exists , execute a different file

Good Morning All, I'm a novice and please excuse me if i did miss some of the forum rules. What my intention is, i have a file (services) residing @ /u01/Oracle/services. I know i can use the find command to find the "service" file. I get this file from a windows box and there is no certain... (8 Replies)
Discussion started by: thinkingeye
8 Replies

8. Shell Programming and Scripting

How to execute command present config file?

I have written the following shell script #!/bin/bash file="/home/CSV/data.csv" badfile="/home/CSV/bad/" while IFS= read -r line do num_fields=`echo "$line" | awk -F'|' '{print NF}'` field1=`echo "$line" | awk -F'|' '{print $1}'` echo $num_fields echo $field1 done <"$file" the code is... (3 Replies)
Discussion started by: Tomar
3 Replies

9. Shell Programming and Scripting

Verify if filename exists

Hi, I have a variable returned from Oracle SQL Function which holds file names. I would like to test if all the file names mentioned in the string exists in a directory. If all the files exists print "exists", even if one file does not exists print "Does not exists". e.g. ... (3 Replies)
Discussion started by: pointers1234
3 Replies

10. Shell Programming and Scripting

Execute a Command in a .Dat File and use it in other Files

We have a process where we store the database password in a config file like below from where the password is picked up and used in Database Scripts ID, Password But we now have a Audit Requirement not to have the passwords in Config Files directly. We have a command which could fetch the... (2 Replies)
Discussion started by: infernalhell
2 Replies
FLOCK(1)                                                           User Commands                                                          FLOCK(1)

NAME
flock - manage locks from shell scripts SYNOPSIS
flock [options] file|directory command [arguments] flock [options] file|directory -c command flock [options] number DESCRIPTION
This utility manages flock(2) locks from within shell scripts or from the command line. The first and second of the above forms wrap the lock around the execution of a command, in a manner similar to su(1) or newgrp(1). They lock a specified file or directory, which is created (assuming appropriate permissions) if it does not already exist. By default, if the lock cannot be immediately acquired, flock waits until the lock is available. The third form uses an open file by its file descriptor number. See the examples below for how that can be used. OPTIONS
-c, --command command Pass a single command, without arguments, to the shell with -c. -E, --conflict-exit-code number The exit code used when the -n option is in use, and the conflicting lock exists, or the -w option is in use, and the timeout is reached. The default value is 1. -F, --no-fork Do not fork before executing command. Upon execution the flock process is replaced by command which continues to hold the lock. This option is incompatible with --close as there would otherwise be nothing left to hold the lock. -e, -x, --exclusive Obtain an exclusive lock, sometimes called a write lock. This is the default. -n, --nb, --nonblock Fail rather than wait if the lock cannot be immediately acquired. See the -E option for the exit code used. -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. -s, --shared Obtain a shared lock, sometimes called a read lock. -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. -w, --wait, --timeout seconds Fail if the lock cannot be acquired within seconds. Decimal fractional values are allowed. See the -E option for the exit code used. The zero number of seconds is interpreted as --nonblock. --verbose Report how long it took to acquire the lock, or why the lock could not be obtained. -V, --version Display version information and exit. -h, --help Display help text and exit. EXAMPLES
shell1> flock /tmp -c cat shell2> flock -w .007 /tmp -c echo; /bin/echo $? Set exclusive lock to directory /tmp and the second command will fail. shell1> flock -s /tmp -c cat shell2> flock -s -w .007 /tmp -c echo; /bin/echo $? Set shared lock to directory /tmp and the second command will not fail. Notice that attempting to get exclusive lock with second command would fail. shell> flock -x local-lock-file echo 'a b c' Grab the exclusive lock "local-lock-file" before running echo with 'a b c'. ( flock -n 9 || exit 1 # ... commands executed under lock ... ) 9>/var/lock/mylockfile The form is convenient inside shell scripts. The mode used to open the file doesn't matter to flock; using > or >> allows the lock- file to be created if it does not already exist, however, write permission is required. Using < requires that the file already exists but only read permission is required. [ "${FLOCKER}" != "$0" ] && exec env FLOCKER="$0" flock -en "$0" "$0" "$@" || : This is useful boilerplate code for shell scripts. Put it at the top of the shell script you want to lock and it'll automatically lock itself on the first run. If the env var $FLOCKER is not set to the shell script that is being run, then execute flock and grab an exclusive non-blocking lock (using the script itself as the lock file) before re-execing itself with the right arguments. It also sets the FLOCKER env var to the right value so it doesn't run again. EXIT STATUS
The command uses sysexits.h return values for everything, except when using either of the options -n or -w which report a failure to acquire the lock with a return value given by the -E option, or 1 by default. When using the command variant, and executing the child worked, then the exit status is that of the child command. AUTHOR
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 Linux Kernel Archive <https://www.kernel.org/pub/linux/utils /util-linux/>. util-linux July 2014 FLOCK(1)
All times are GMT -4. The time now is 08:52 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy