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unshar(1) User Commands unshar(1)

NAME
unshar - unpack a shar archive

SYNOPSIS
unshar [-flag [value]]... [--opt-name[[=| ]value]]... [<file>...]

The operands that this program operates on may be specified either on the command line or
read from standard input, one per line. In that input, leading and trailing white space
is stripped, blank lines are ignored. Standard input may not be a terminal.

DESCRIPTION
Unshar scans the input files (typically email messages) looking for the start of a shell
archive. If no files are given, then standard input is processed instead. It then passes
each archive discovered through an invocation of the shell program to unpack it..Pp This
program will perform its function for every file named on the command line or every file
named in a list read from stdin. The arguments or input names must be pre-existing files.
The input list may contain comments, which are blank lines or lines beginning with a '#'
character.

OPTIONS
-d dir, --directory=dir
unpack into the directory dir.

The input file names are relative to the current directory when the program was
started. This option tells unshar to insert a cd <dir> commad at the start of the
shar text written to the shell.

-c, --overwrite
overwrite any pre-existing files.

This option is passed through as an option to the shar file. Many shell archive
scripts accept a -c argument to indicate that existing files should be overwritten.

-f, --force
This is an alias for the --overwrite option.

-E split-mark, --split-at=split-mark
split input on split-mark lines. The default split-mark for this option is:
exit 0

With this option, unshar isolates each different shell archive from the others
which have been placed in the same file, unpacking each in turn, from the beginning
of the file to the end. Its proper operation relies on the fact that many shar
files are terminated by a readily identifiable string at the start of the last
line.

For example, noticing that most `.signatures' have a double hyphen ("--") on a line
right before them, one can then sometimes use --split-at=--. The signature will
then be skipped, along with the headers of the following message.

-e, --exit-0
split input on "exit 0" lines. This option must not appear in combination with any
of the following options: split-at.

Most shell archives end with a line consisting of simply "exit 0". This option is
equivalent to (and conflicts with) --split-at="exit 0".

-D, --debug
debug the shell code.

"set -x" will be emitted into the code the shell interprets.

-h, --help
Display usage information and exit.

-!, --more-help
Pass the extended usage information through a pager.

-R [cfgfile], --save-opts[=cfgfile]
Save the option state to cfgfile. The default is the last configuration file
listed in the OPTION PRESETS section, below. The command will exit after updating
the config file.

-r cfgfile, --load-opts=cfgfile, --no-load-opts
Load options from cfgfile. The no-load-opts form will disable the loading of ear‐
lier config/rc/ini files. --no-load-opts is handled early, out of order.

-v [{v|c|n}], --version[={v|c|n}]
Output version of program and exit. The default mode is `v', a simple version.
The `c' mode will print copyright information and `n' will print the full copyright
notice.

OPTION PRESETS
Any option that is not marked as not presettable may be preset by loading values from con‐
figuration ("RC" or ".INI") file(s). The file "$HOME/.sharrc" will be used, if present.

FILES
See OPTION PRESETS for configuration files.

EXIT STATUS
One of the following exit values will be returned:

0 (EXIT_SUCCESS)
Successful program execution.

1 (EXIT_FAILURE)
There was an error in command usage.

2 (EXIT_POPEN_PROBLEM)
cannot spawn or write to a shell process

3 (EXIT_CANNOT_CREATE)
cannot create output file

4 (EXIT_BAD_DIRECTORY)
the working directory structure is invalid

5 (EXIT_NOMEM)
memory allocation failure

6 (EXIT_INVALID)
invalid input, does not contain a shar file

66 (EX_NOINPUT)
A specified configuration file could not be loaded.

70 (EX_SOFTWARE)
libopts had an internal operational error. Please report it to autogen-
users AT lists.net. Thank you.