get the data in a file into single string Post: 302205308

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Top Forums UNIX for Dummies Questions & Answers get the data in a file into single string Post 302205308 by drl on Saturday 14th of June 2008 08:07:24 AM

06-14-2008

Registered User

Hi.

I think you should be pleased that you created a solution. There are many ways to approach problems in *nix. For long files, while-read loops can be very time-consuming. You can often use utilities to process an entire file. Here is one example with your situation:

Code:

#!/bin/bash -

# @(#) s2       Demonstrate collapse of all lines in file to a single line.

echo
echo "(Versions displayed with local utility \"version\")"
version >/dev/null 2>&1 && version =o $(_eat $0 $1) tr sed
echo

FILE=${1-data1}
echo " Input file $FILE:"
cat $FILE

temp=$( tr '\n' ',' <$FILE )

echo
echo " Contents of string after tr:"
echo $temp

temp1=${temp/%,/}
echo
echo " Contents of string after clean-up:"
echo $temp1

temp2=$( echo $temp | sed 's/,$//' )
echo
echo " Contents of cleaned string, sed alternative:"
echo $temp2

exit 0

Producing:

Code:

% ./s2

(Versions displayed with local utility "version")
Linux 2.6.11-x1
GNU bash 2.05b.0
tr (coreutils) 5.2.1
GNU sed version 4.1.2

 Input file data1:
1
2
3
4
5

 Contents of string after tr:
1,2,3,4,5,

 Contents of string after clean-up:
1,2,3,4,5

 Contents of cleaned string, sed alternative:
1,2,3,4,5

The tr translates characters in an entire file. The subsequent special assignment with the variable is peculiar to some shells, so I provided a alternative sed step to remove the final ",".

See man pages for details.

For the size of problems such as this is likely to be, most solutions are probably the same in efficiency. However, it is useful to know about other methods in general ... cheers, drl

drl

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LEARN ABOUT OSX

echo

ECHO(1) 						    BSD General Commands Manual 						   ECHO(1)

NAME

     echo -- write arguments to the standard output

SYNOPSIS

     echo [-n] [string ...]

DESCRIPTION

     The echo utility writes any specified operands, separated by single blank (' ') characters and followed by a newline ('
') character, to the
     standard output.

     The following option is available:

     -n    Do not print the trailing newline character.  This may also be achieved by appending 'c' to the end of the string, as is done by iBCS2
	   compatible systems.	Note that this option as well as the effect of 'c' are implementation-defined in IEEE Std 1003.1-2001
	   (``POSIX.1'') as amended by Cor. 1-2002.  Applications aiming for maximum portability are strongly encouraged to use printf(1) to sup-
	   press the newline character.

     Some shells may provide a builtin echo command which is similar or identical to this utility.  Most notably, the builtin echo in sh(1) does
     not accept the -n option.	Consult the builtin(1) manual page.

EXIT STATUS

     The echo utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

     builtin(1), csh(1), printf(1), sh(1)

STANDARDS

     The echo utility conforms to IEEE Std 1003.1-2001 (``POSIX.1'') as amended by Cor. 1-2002.

BSD
								  April 12, 2003							       BSD

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