testing if files exist


 
Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers testing if files exist
# 8  
Old 05-01-2008
Quote:
Originally Posted by shalua
I need to check following three things:

a) a file exists but is zero byte
b) a file exists with non-zero bytes
c) a file doesn't exist at all

What switches do we use? Is it -f, -s, -z. Please explain the difference in these!

Many Thanks
Shalua
a) ... [ ! -s ${FILENAME} ]
b) ... [ -s ${FILENAME} ]
c) ... [ ! -f ${FILENAME} ]

Hope that sets you in the right direction.
 
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Find command when there exist many files

I want to run find and wondering if it struggles when there are many files. I have tried and does not seem to complain. Is this correct? (8 Replies)
Discussion started by: kristinu
8 Replies

2. UNIX for Beginners Questions & Answers

Check if 10 files exist

Hi All, Whenever i get 10 files(file names like sales*) then another file need to create. May i know how to implement this in KSH. (4 Replies)
Discussion started by: siddireddy
4 Replies

3. Shell Programming and Scripting

File exist for multiple files

Hi, I am unable to achieve the file exist conditions if there are multiple files same similar name for e.g. in a $Direct i am having files like aus.txt aus.txt_pr aus.txt_2012 i need to put a file exist condition like which is not working then echo "File present" but the... (9 Replies)
Discussion started by: rohit_shinez
9 Replies

4. Shell Programming and Scripting

Script to mail if files do not exist

Hi all! I need some help with a script, but I want to make it better, my script prints the last two files on each directory: echo " " echo "******************* mediation_sgsn:***********************" ls -lrt /moneta_collected03/mediation_sgsn | tail -2 echo " " echo... (6 Replies)
Discussion started by: fretagi
6 Replies

5. UNIX for Dummies Questions & Answers

Rsync copy files if dont exist

I have a setup where I have two drives. TV TVbackup For what ever reason, I have a lot of content on my TVbackup drive which isn't on my TV drive. I want to copy all the files across which are on TVbackup but are not currently on TV. If there is a file with the same name but a... (2 Replies)
Discussion started by: Spadez
2 Replies

6. Shell Programming and Scripting

bash script for testing existence of files/folders and creating if neither exist

Hi, I am new to shell-scripting, and doing a lot of reading. I am having some trouble getting started with a simple testing of scripting. I have been experimenting with if, loops, for, test, etc., but still unsure. I seem to have the hang of it when it comes to creating a single file or... (6 Replies)
Discussion started by: me2
6 Replies

7. Shell Programming and Scripting

Find out whether files exist.

I have the following data stored in a file. 1 /home/file13 /home/file2 2 /home/file41 /home/file654 3 /home/file61 /home/file45 4 /home/file81 /home/file43 ... I want to print the first column provided the files represented by the second and third column exist. How to do that? (3 Replies)
Discussion started by: kevintse
3 Replies

8. Shell Programming and Scripting

Delete files if they exist

In a directory a number of files named res0.om res1.om ... resN.om where N can be any unknown number between 1 and 999 Please help me filling out the gaps in the following csh script: I need to delete all files exept res0.om The easy way is rm res1* rm res2* rm res3* rm res4*... (5 Replies)
Discussion started by: pederlol
5 Replies

9. Shell Programming and Scripting

perl: When dealing with files that do not exist

I have a process run weekly where I must convert data formats for about thirty files. I read a text file that provides all of the filenames and switch settings. My perl code is: for ($j = 1; $j <= $k; $j++) { open(FIN2,$fin2) || die "open: $!"; do other stuff } Every once in... (2 Replies)
Discussion started by: joeyg
2 Replies

10. Shell Programming and Scripting

How to check a file exist and do a copy of other files

Hi, I would like to perform bash which would check the file A.txt to be size 0 or not. If the size is 0, I would copy file B.txt to replace A.txt. Please help. Thanks. -Jason (6 Replies)
Discussion started by: ahjiefreak
6 Replies
Login or Register to Ask a Question
bup-drecurse(1) 					      General Commands Manual						   bup-drecurse(1)

NAME
bup-drecurse - recursively list files in your filesystem SYNOPSIS
bup drecurse [-x] [-q] [--exclude path] [--exclude-from filename] [--profile] <path> DESCRIPTION
bup drecurse traverses files in the filesystem in a way similar to find(1). In most cases, you should use find(1) instead. This program is useful mainly for testing the file traversal algorithm used in bup-index(1). Note that filenames are returned in reverse alphabetical order, as in bup-index(1). This is important because you can't generate the hash of a parent directory until you have generated the hashes of all its children. When listing files in reverse order, the parent directory will come after its children, making this easy. OPTIONS
-x, --xdev, --one-file-system don't cross filesystem boundaries. -q, --quiet don't print filenames as they are encountered. Useful when testing performance of the traversal algorithms. --exclude=path a path to exclude from the backup (can be used more than once) --exclude-from=filename a file that contains exclude paths (can be used more than once) --profile print profiling information upon completion. Useful when testing performance of the traversal algorithms. EXAMPLE
bup drecurse -x / SEE ALSO
bup-index(1) BUP
Part of the bup(1) suite. AUTHORS
Avery Pennarun <apenwarr@gmail.com>. Bup unknown- bup-drecurse(1)