Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

awk if file exists

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting awk if file exists
# 1  
Old 06-16-2011
awk if file exists
in awk how would check if a file exists if its possible. I found a script that has code to do it, but when i try it myself, it fails.
Code:
#!/bin/bash

ls -lTtRrU | awk '
BEGIN {
	working_directory = ".";
}

{
	file_name = "";
	absolute_path = "";
		
	if ($0 ~ /^\.\/.*:$/ ) {
		working_directory = substr($0, 1, length($0) - 1);
		gsub(" ", "\\ ", working_directory);
	} else if ($0 ~ /.*[jpeg|jpg|png]$/) {
		count++;
		for (i = 10; i < NF; i++)
		{
			file_name = file_name $i "\\ ";
		}
		file_name = file_name $NF;
		absolute_path = working_directory "/" file_name;
#this always returns 0
		if ( system( "[ -f " absolute_path " ] " ) )
		{
			print absolute_path;
		}
	}
}

END {
}'

# 2  
Old 06-16-2011
Quote:
Originally Posted by xxxpigeonxxx
Code:
#this always returns 0
     if ( system( "[ -f " absolute_path " ] " ) )
     {
	print absolute_path;
     }

Does the file in absolute_path exist? If it does, then zero is the expected return code. Any non-zero indicates failure. So, the test, in my opinion should be written this way:

Code:
if( system( "[ -f " absolute_path " ] " )  == 0 )
{
   printf( "file exists\n" );
}

# 3  
Old 06-17-2011
thanks. why is it that the return value is 0 on success instead of failure?
# 4  
Old 06-17-2011
Quote:
Originally Posted by xxxpigeonxxx
thanks. why is it that the return value is 0 on success instead of failure?
https://www.unix.com/302487850-post5.html
This User Gave Thanks to yazu For This Post:
agama
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Search if file exists for a file pattern stored in array

Hi experts, I have two arrays one has the file paths to be searched in , and the other has the files to be serached.For eg searchfile.dat will have abc303 xyz123 i have to search for files that could be abc303*.dat or for that matter any extension . abc303*.dat.gz The following code... (2 Replies)
Discussion started by: 100bees
2 Replies

2. Shell Programming and Scripting

File exists, but cannot be opened.How to check- whether it could be opened to read when it exists

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)
Discussion started by: rxg
2 Replies

3. Windows & DOS: Issues & Discussions

Script that, if file exists in Samba share, moves file to Unix server

I'm looking to do pretty much what the title says. I want a script that runs, it can run on Unix or Windows, doesn't matter, and searches a Samba shares for a .txt file. If the file exists, the script will move (or possibly copy) the file from the Samba share into a directory on our Unix... (3 Replies)
Discussion started by: twcostello
3 Replies

4. Shell Programming and Scripting

Script to check for the file existence, if file exists it should echo the no of modified days

Hi, I am looking for a shell script with the following. 1. It should check whether a particular file exists in a location #!/bin/sh if ; then echo "xxx.txt File Exists" else echo "File Not Found" fi 2. If file exists, it should check for the modified date and run a command... (2 Replies)
Discussion started by: karthikeyan_mac
2 Replies

5. Shell Programming and Scripting

Newbie.. Find if a file exists and open, if not create the desired file..

Hey all, I'm brand new to script writing, I'm wanting to make a script that will ask for a file and then retrieve that file if it exists, and if it doesn't exist, create the file with the desired name, and I'm completely stuck.. so far.. #! bin/bash echo "Enter desired file" read "$file" if ... (5 Replies)
Discussion started by: Byrang
5 Replies

6. Shell Programming and Scripting

Grep pattern from different file and display if it exists in the required file

Hi, I have two files say xxx.txt and yyy.txt. xxx.txt is with list of patterns within double quotes. Eg. "this is the line1" "this is the line2" The yyy.txt with lot of lines. eg: "This is a test message which contains rubbish information just to fill the page which is of no use. this is... (3 Replies)
Discussion started by: abinash
3 Replies

7. Shell Programming and Scripting

file exists

hello, I want to know if a file exists, but do not know contador = 0 while(file$contador exists) do bla bla bla contador=$(($contador+1)) done how can i do it? thanks (4 Replies)
Discussion started by: uri_crack
4 Replies

8. Shell Programming and Scripting

File Exists

Hi, I have scenerio where i need to check 3 files whether they are of current day files and then count should not be equal to zero. how to achieve the same please let me know. Vishal (17 Replies)
Discussion started by: shady4u
17 Replies

9. Shell Programming and Scripting

Need to write a script in UNIX to find a file if another file exists

So I have a lot of Java applications on my servers all having their own folder from the applications subdirectory. Now, I need to do the following. Search all the applications subdirectories for message.jar. If the message.jar file exists, I need to search the application directory for... (1 Reply)
Discussion started by: mmdawg
1 Replies

10. Shell Programming and Scripting

Check File Exists and compare to previous day file script

We have data files that are ftp'd every morning to a SUN server. The file names are exactly the same except for that each has the date included in its name. I have to write script to do 2 things: STEP 1) Verify that the file arrived in morning. STEP 2) Compare the file size of the current... (3 Replies)
Discussion started by: rbknisely
3 Replies
Login or Register to Ask a Question