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Checking existence of file using awk

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# 1  
Old 01-22-2012
Checking existence of file using awk
Hi,

I need to check whether a particular file exists ot not using awk.
Can anyone help me please?
For Example:script that i am using:
Code:
awk '{filename =$NF;
rc=(system("test -r filename")) print $rc;}' "$1"

is not working.
Here I am passing a text file as input whose last word contains a filename..
Input File FOrmat
Code:
word1 word2 <filename>
word1 word2 word3 <filename>

and so on

Thanks In Advance
Manish
Last edited by Franklin52; 01-23-2012 at 10:09 AM.. Reason: Please use code tags for data and code samples, thank you
# 2  
Old 01-22-2012
How about this
Code:
 awk ' { FN=$NF
   if ((getline < FN) > 0) {
       close(FN);
       print FN " exists and is readable"
    }}' infile

# 3  
Old 01-22-2012
Hi,

Its not working Smilie
I am using this script:
Code:
awk ' { FN=$NF
if ((getline < FN) > 0) {
close(FN);
print FN " exists and is readable"
}
}' "$1"

and i am calling this as <scriptname> <inputfilename>.
Also i need to print message when the file does not exist.
Please help.
Last edited by Franklin52; 01-23-2012 at 10:09 AM.. Reason: Please use code tags for data and code samples, thank you
# 4  
Old 01-22-2012
You should call the awk statement with the input file, it will extract the filename and check!

--ahamed

---------- Post updated at 07:53 PM ---------- Previous update was at 07:48 PM ----------

Just curious why do you need an awk statement to check the file existence?

--ahamed
# 5  
Old 01-23-2012
File must exist and be > 0 bytes.

Below includes does not exist message:
Code:
awk ' { FN=$NF
if ((getline < FN) > 0) {
close(FN);
print FN " exists and is readable"
} else {
  print FN " does not exist"
}}' "$1"

What issue are you getting, are there any error messages?
This User Gave Thanks to Chubler_XL For This Post:
manish007
# 6  
Old 01-23-2012
Thanks a lot!! It works now.

---------- Post updated at 02:27 PM ---------- Previous update was at 02:23 AM ----------

Hi,

there is a new requirement in above script.
Apart from input filr a string is also sent as second parameter.
I have to search the filename whether that contains the passed input string or not.
Here is the script that i am using:
#! /usr/bin/ksh
stringtomatch="$2"
awk ' { FN=$NF
if(0!=index($NF,stringtomatch))
{
if ((getline < FN) > 0) {
close(FN);
print FN " exists and is readable"
} else {
print FN " does not exist"
}
}else {
print FN "does not contain string"
}
}' "$1"
Please help.TIA-Manish
# 7  
Old 01-23-2012
awk -v stringtomatch="$stringtomatch" to get the variable inside awk.
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