10-14-2008
It's not guaranteed... it depends what kind of data it contains. If it contains ASCII strings interspersed with unprintable characters then strings will do the job. If it's encrypted or in a different encoding (EBCDIC) then more work will be required... the question is too open ended without more information, i.e. what type of main frame, what type of file it is, etc.
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LEARN ABOUT FREEBSD
strings
STRINGS(1) BSD General Commands Manual STRINGS(1)
NAME
strings -- print the strings of printable characters in files
SYNOPSIS
strings [-a | --all] [-e encoding | --encoding=encoding] [-f | --print-file-name] [-h | --help] [-n number | --bytes=number | -number] [-o]
[-t radix | --radix=radix] [-v | --version] [file ...]
DESCRIPTION
For each file specified, the strings utility prints contiguous sequences of printable characters that are at least n characters long and are
followed by an unprintable character. The default value of n is 4. By default, the strings utility only scans the initialized and loaded
sections of ELF objects; for other file types, the entire file is scanned. The strings utility is mainly used for determining the contents
of non-text files.
If no file name is specified as an argument, standard input is read.
The following options are available:
-a | --all
For ELF objects, scan the entire file for printable strings.
-e encoding | --encoding=encoding
Select the character encoding to be used while searching for strings. Valid values for argument encoding are:
s for single 7-bit-byte characters (ASCII, ISO 8859).
S for single 8-bit-byte characters.
l for 16-bit little-endian.
b for 16-bit big-endian.
L for 32-bit little-endian.
B for 32-bit big-endian.
The default is to assume that characters are encoded using a single 7-bit byte.
-f | --print-file-name
Print the name of the file before each string.
-h | --help
Print a usage summary and exit.
-n number | --bytes=number | -number
Print the contiguous character sequence of at least number characters long, instead of the default of 4 characters.
-o Equivalent to specifying -t o.
-t radix | --radix=radix
Print the offset from the start of the file before each string using the specified radix. Valid values for argument radix are:
d for decimal
o for octal
x for hexadecimal
-v | --version
Display a version identifier and exit.
EXIT STATUS
The strings utility exits 0 on success, and >0 if an error occurs.
EXAMPLES
To display strings in /bin/ls use:
$ strings /bin/ls
To display strings in all sections of /bin/ln use:
$ strings -a /bin/ln
To display strings in all sections of /bin/cat prefixed with the filename and the offset within the file use:
$ strings -a -f -t x /bin/cat
SEE ALSO
ar(1), nm(1), objdump(1), ranlib, readelf(1), size(1)
HISTORY
The first FreeBSD strings utility appeared in FreeBSD v3. It was later discontinued in FreeBSD v5, when i386-only a.out format was dropped in
favor of ELF.
AUTHORS
The strings utility was re-written by S.Sam Arun Raj <samarunraj@gmail.com>. This manual page was written by S.Sam Arun Raj
<samarunraj@gmail.com>.
BSD
December 19, 2011 BSD