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Full Discussion: Add Date string at end of line
Top Forums Shell Programming and Scripting Add Date string at end of line Post 302900071 by alister on Saturday 3rd of May 2014 04:56:14 PM
Old 05-03-2014
Quote:
Originally Posted by protocomm
Don't understand, can you give me an example when this command line doesn't work ? if i double quote the command subshell cat, i can read file with spaces ?
If the following script is problems.sh:
Code:
 
mkdir newdir && cd newdir

cat <<EOF > file.txt
*.txt


a   b   .txt
EOF

echo BEGIN CORRECT SOLUTION
sed 's/\.txt$/_'$(date +%m%Y)'&/' file.txt

echo
echo BEGIN INCORRECT SOLUTION
for line in $(cat file.txt); do
	foo=$(date +"%m%Y")
	echo ${line%.txt}_$foo.txt
done

echo
echo BEGIN INCORRECT QUOTED SOLUTION
for line in "$(cat file.txt)"; do
        foo=$(date +"%m%Y")
        echo ${line%.txt}_$foo.txt
done

Its output:
Code:
$ sh problems.sh 
BEGIN CORRECT SOLUTION
*_052014.txt


a   b   _052014.txt

BEGIN INCORRECT SOLUTION
file_052014.txt
a_052014.txt
b_052014.txt
_052014.txt

BEGIN INCORRECT QUOTED SOLUTION
file.txt a b _052014.txt

Note how your code expands the *.txt into file.txt. Note also how the blank lines are lost. And finally, obeserve how it splits the single line "a b _052014.txt" into three lines.

The quoted version fails because jams the entire file into the variable and the loop only iterates once. It also needs to quote the $line in the echo statement (this is the reason that *.txt still becomes file.txt).

Regards,
Alister
Last edited by alister; 05-03-2014 at 06:03 PM..
This User Gave Thanks to alister For This Post:
protocomm
 

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LEARN ABOUT LINUX

gnomevfs-cat

gnomevfs-cat(1)                                                    User Commands                                                   gnomevfs-cat(1)

NAME

       gnomevfs-cat - print a file to standard output using the VFS system

SYNOPSIS

       gnomevfs-cat URI

DESCRIPTION

       gnomevfs-cat prints a file to standard output using the virtual file system to access the file via a URI.

OPERANDS

       The following operands are supported:

       URI             Specifies the file location in standard URI format.

EXAMPLES

       Example 1: Cat a File From a Web Server

       example% gnomevfs-cat http://www.sun.com

       Example 2: Cat a Local File

       example% gnomevfs-cat file:///home/user/README.txt

ENVIRONMENT VARIABLES

       See environ(5) for descriptions of the following environment variables: NLSPATH.

EXIT STATUS

       The exit value 0 is returned regardless of success or failure.

FILES

       The following files are used by this application:

       /usr/bin/gnomevfs-cat   Executable to print a file to standard output using the VFS system

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWgnome-vfs                |
       +-----------------------------+-----------------------------+
       |Interface stability          |External                     |
       +-----------------------------+-----------------------------+

SEE ALSO

       gnomevfs-copy(1), gnomevfs-info(1), gnomevfs-ls(1), gnomevfs-mkdir(1)

NOTES

       Written by Stephen Browne, Sun Microsystems Inc., 2004.

SunOS 5.10                                                          6 Sep 2004                                                     gnomevfs-cat(1)
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