Writing to a file within a script Post: 302116692

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Top Forums Shell Programming and Scripting Writing to a file within a script Post 302116692 by cfajohnson on Monday 7th of May 2007 04:48:01 PM

05-07-2007

Registered User

Quote:

Originally Posted by Jaken

Hi,

At the moment i have a script where it asks the user if they want to create a file and what to put in the file. The problem is when the script is run the user inputs the information, though when they are finished typing what they want to be in the file there is no way for the program to know they are finished or the user to exit.

The code that i am using for this currently is:

Code:

echo "\nPlease enter a name of a file that you wish to create"
read file
echo "\nPlease type something that you wish to be inside it\n"                                                                                     
read desc
cat >$file
$desc
echo "Thank you for creating a file"

Both read and cat are reading from the standard input, i.e., the terminal. If you want to send the contents of a variable to a file, use printf:
Code:
printf "%s\n" "$desc" > "$file"
Or, you can use cat with a here document:
Code:
cat > "$file" <<EOF
$desc
EOF
Or, you can send the user's input directly to the file with cat:
Code:
printf "%s\n" "Please type something that you wish to be inside it" \
               "Press Ctrl-d when you are finished"
cat > "$file"

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LEARN ABOUT LINUX

bzexe

BZEXE(1)						      General Commands Manual							  BZEXE(1)

NAME

       bzexe - compress executable files in place

SYNOPSIS

       bzexe [ name ...  ]

DESCRIPTION

       The  bzexe  utility  allows you to compress executables in place and have them automatically uncompress and execute when you run them (at a
       penalty in performance).  For example if you execute ``bzexe /bin/cat'' it will create the following two files:
	   -r-xr-xr-x  1 root  bin   9644 Feb 11 11:16 /bin/cat
	   -r-xr-xr-x  1 bin   bin  24576 Nov 23 13:21 /bin/cat~
       /bin/cat~ is the original file and /bin/cat is the self-uncompressing executable file.  You can remove /bin/cat~ once  you  are	sure  that
       /bin/cat works properly.

       This utility is most useful on systems with very small disks.

OPTIONS

       -d     Decompress the given executables instead of compressing them.

SEE ALSO

       bzip2(1), znew(1), zmore(1), zcmp(1), zforce(1)

CAVEATS

       The  compressed	executable  is a shell script. This may create some security holes. In particular, the compressed executable relies on the
       PATH environment variable to find gzip and some other utilities (tail, chmod, ln, sleep).

BUGS

       bzexe attempts to retain the original file attributes on the compressed executable, but you may have to fix them manually  in  some  cases,
       using chmod or chown.

																	  BZEXE(1)

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