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Top Forums Shell Programming and Scripting Bash script to extract paragraph with globs in it Post 302992545 by drysdalk on Monday 27th of February 2017 08:00:16 AM
Old 02-27-2017
Hi,

I suspect the error is coming from this change you made:

tmp=`/home/dsiddiqui/basic_bash/tempfile`

Keep this line the way it was originally:

tmp=`/bin/tempfile`

The quotes I'm using here are backticks, and have the effect of running an external command, namely /bin/tempfile. This line does not simply set the filename directly by assigning text into a variable.

The purpose of the tempfile program is to generate a temporary file under /tmp that is guaranteed not to have existed already, so you don't have to worry about clobbering someone else's output. When run, it creates the file and returns the filename as output, so this basically results in the variable 'tmp' being set to your newly-created temporary file.

So if you try again with the original line and let us know how it goes, we can take things from there.

As for the variable-length output: I would have expected the beginning and end lines of every block would be identical, as a clear way of demarcating one data section from another ? If not, then if you could give us some idea of how the block markers are expected to vary I'll see what I can suggest.
 

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TEMPFILE(1)						      General Commands Manual						       TEMPFILE(1)

NAME
tempfile - create a temporary file in a safe manner SYNOPSIS
tempfile [-d DIR] [-p STRING] [-s STRING] [-m MODE] [-n FILE] [--directory=DIR] [--prefix=STRING] [--suffix=STRING] [--mode=MODE] [--name=FILE] [--help] [--version] DESCRIPTION
tempfile creates a temporary file in a safe manner. It uses tempnam(3) to choose the name and opens it with O_RDWR | O_CREAT | O_EXCL. The filename is printed on standard output. See tempnam(3) for the actual steps involved in directory selection. The directory in which to create the file might be searched for in this order (but refer to tempnam(3) for authoritative answers): a) In case the environment variable TMPDIR exists and contains the name of an appropriate directory, that is used. b) Otherwise, if the --directory argument is specified and appropriate, it is used. c) Otherwise, P_tmpdir (as defined in <stdio.h>) is used when appropriate. d) Finally an implementation-defined directory (/tmp) may be used. OPTIONS
-d, --directory DIR Place the file in DIR. -m, --mode MODE Open the file with MODE instead of 0600. -n, --name FILE Use FILE for the name instead of tempnam(3). The options -d, -p, and -s are ignored if this option is given. -p, --prefix STRING Use up to five letters of STRING to generate the name. -s, --suffix STRING Generate the file with STRING as the suffix. --help Print a usage message on standard output and exit successfully. --version Print version information on standard output and exit successfully. RETURN VALUES
An exit status of 0 means the temporary file was created successfully. Any other exit status indicates an error. BUGS
Exclusive creation is not guaranteed when creating files on NFS partitions. tempfile cannot make temporary directories. tempfile is dep- recated; you should use mktemp(1) instead. EXAMPLE
#!/bin/sh #[...] t=$(tempfile) || exit trap "rm -f -- '$t'" EXIT #[...] rm -f -- "$t" trap - EXIT exit SEE ALSO
tempnam(3), mktemp(1) Debian 27 Jun 2012 TEMPFILE(1)
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