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Full Discussion: Grep for empty file
Top Forums Shell Programming and Scripting Grep for empty file Post 302358504 by cfajohnson on Friday 2nd of October 2009 06:49:26 PM
Old 10-02-2009
Quote:
Originally Posted by ripat
The OP says that sed leaves a \n in the "empty file". So its size will be 1 byte and your test will show not empty.

You could also use the stat command:
Code:
if [[ $(stat -c %s file) == 1 ]];then echo "kind of empty";fi


The stat command is not standard, and there are different versions:

Code:
$ stat -c %s .bashrc 
stat: illegal option -- c
usage: stat [-FlLnqrsx] [-f format] [-t timefmt] [file ...]



---------- Post updated at 06:49 PM ---------- Previous update was at 06:48 PM ----------
Quote:
Originally Posted by plawr
I have a program that takes a file in which I use a sed to remove some data that is not needed. If all of the data is removed. I want to grep for that in the file and print that there is no data left in the file. When I use sed, I replace a word with nothing but it still seems to leave a return carriage. Please give me some ideas on how to do this. Thanks!

Fix the sed command to delete the line instead of just the word.
 

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LEARN ABOUT PLAN9

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
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