Visit Our UNIX and Linux User Community

how to check if a file has zero records

Thread Tools Search this Thread
Top Forums Shell Programming and Scripting how to check if a file has zero records
# 1  
Old 10-01-2009
how to check if a file has zero records

I want to do conditional logic on whether a file has 0 bytes or more than 0 bytes.

what is the easiest way to do this?
# 2  
Old 10-01-2009
if [ -s $file ]
    echo "$file has a size"
    echo "$file is empty"

# 3  
Old 10-01-2009

[ -s "$file_name" ] && echo "non zero length" || echo "zero lenght"

Previous Thread | Next Thread
Test Your Knowledge in Computers #856
Difficulty: Medium
React was created by Jordan Renke, a software engineer at Facebook.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Script to check field value from a file records

I need a script to check the records in a file , if any value match transfer the record in error.txt file. 1- If any of the any field value is NULL(nothing in this field) Record1|Record2|Record3|Record4|Record5|DATE1|DATE2 Example: 11111111|22222222|NULL|12|444|27042018|27042018... (8 Replies)
Discussion started by: vivekn
8 Replies

2. Shell Programming and Scripting

To check Blank Lines, Blank Records and Junk Characters in a File

Hi All Need Help I have a file with the below format (ABC.TXT) : «┐┐ABCDHEJJSJJ|XCBJSKK01|M|7348974982790 HDFLJDKJSKJ|KJALKSD02|M|7378439274898 KJHSAJKHHJJ|LJDSAJKK03|F|9898982039999 (cont......) I need to write a script where it will check for : blank lines (between rows,before... (6 Replies)
Discussion started by: chatwithsaurav
6 Replies

3. Shell Programming and Scripting

Separate records of a file on 2 types of records

Hi I am new to shell programming in unix Please if I can provide help. I have a file structure of a header record and "N" detail records. The header record will be the total number of detail records I need to split the file in 2: One for the header Another for all detail records Could... (1 Reply)
Discussion started by: jamcogar
1 Replies

4. Shell Programming and Scripting

Read File and check records for length

I need a script that will run in unix to: 1) Read and input file with 1 column that contains for ex: 0123456789 1234567890 ...etc 2) Checks the first column if it is: a. Numeric from 0 - 9 b. if it is not less... (4 Replies)
Discussion started by: mrn6430
4 Replies

5. Shell Programming and Scripting

Deleting duplicate records from file 1 if records from file 2 match

I have 2 files "File 1" is delimited by ";" and "File 2" is delimited by "|". File 1 below (3 record shown): Doc1;03/01/2012;New York;6 Main Street;Mr. Smith 1;Mr. Jones Doc2;03/01/2012;Syracuse;876 Broadway;John Davis;Barbara Lull Doc3;03/01/2012;Buffalo;779 Old Windy Road;Charles... (2 Replies)
Discussion started by: vestport
2 Replies

6. UNIX for Dummies Questions & Answers

Grep specific records from a file of records that are separated by an empty line

Hi everyone. I am a newbie to Linux stuff. I have this kind of problem which couldn't solve alone. I have a text file with records separated by empty lines like this: ID: 20 Name: X Age: 19 ID: 21 Name: Z ID: 22 Email: Name: Y Age: 19 I want to grep records that... (4 Replies)
Discussion started by: Atrisa
4 Replies

7. Shell Programming and Scripting

Based on num of records in file1 need to check records in file2 to set some condns

Hi All, I have two files say file1 and file2. I want to check the number of records in file1 and if its atleast 2 (i.e., 2 or greater than 2 ) then I have to check records in file2 .If records in file2 is atleast 1 (i.e. if its not empty ) i have to set some conditions . Could you pls... (3 Replies)
Discussion started by: mavesum
3 Replies

8. UNIX for Dummies Questions & Answers

Use records from one file to delete records in another file

file_in_1: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 file_in_2: 9 10 11 12 21 22 23 24 1 2 3 4 17 18 19 20 file_out: (5 Replies)
Discussion started by: kenneth.mcbride
5 Replies

9. Shell Programming and Scripting

Check valid records in really big file with one commend..

Hi, I have a 5 gig file, no record terminators, field terminators are newline. The record length is 768 and I would like to check that every 768th byte is a newline and print out the byte position if it isn't. I would like to do this going either forward or backwards with one command if... (3 Replies)
Discussion started by: vtischuk@yahoo.
3 Replies

10. Shell Programming and Scripting

Count No of Records in File without counting Header and Trailer Records

I have a flat file and need to count no of records in the file less the header and the trailer record. I would appreciate any and all asistance Thanks Hadi Lalani (2 Replies)
Discussion started by: guiguy
2 Replies

Featured Tech Videos