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Top Forums UNIX for Advanced & Expert Users Unix, a file is asciii or not Post 302297501 by hemanth.hg on Friday 13th of March 2009 03:26:31 PM
Old 03-13-2009
Data Unix, a file is asciii or not

Hi,
This query might sound familiar, but I have an issue in finding out whether the file is ascii or not.

The requirement:
1. Check if the file has any only ascii ,line feed , tab. If it contains any non-ASCII it has to fail.
2. The file size will go upto 1.5GB in size.
3. The length of every line is fixed . The number of lines will be upto 1 - 2 million.


What I tried:
I tried the file utility:
-------------------------------------------------------
file "$1" | grep -Fq executable &&
printf "%s is executable.\n" "$1"

and some script suggested in this forum like

ftype=2
file "$1" | /usr/xpg4/bin/grep -Fq ascii && ftype=0
file "$1" |/usr/xpg4/bin/grep -Fq executable && ftype=1
echo $ftype
-------------------------------------------------------
The manual says it will only check for the first 512 bytes. So the above samples aren't working in my case.

Could you please let me know how this can be achieved. Do I need to read every character and check for the ascii value of that character? If yes could you please provide me some sample scripts.

Thanks in advance
Hemanth.
 

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contents(4)                                                        File Formats                                                        contents(4)

NAME
contents - list of files and associated packages SYNOPSIS
/var/sadm/install/contents DESCRIPTION
The file /var/sadm/install/contents is a source of information about the packages installed on the system. This file must never be edited directly. Always use the package and patch commands (see SEE ALSO) to make changes to the contents file. Each entry in the contents file is a single line. Fields in each entry are separated by a single space character. Two major styles of entries exist, old style and new style. The following is the format of an old-style entry: ftype class path package(s) The following is the general format of a new-style entry: path[=rpath] ftype class [ftype-optional-fields] package(s) New-style entries differ for each ftype. The ftype designates the entry type, as specified in pkgmap(4). The format for new-style entries, for each ftype, is as follows: ftype s: path=rpath s class package ftype l: path l class package ftype d: path d class mode owner group package(s) ftype b: path b class major minor mode owner group package ftype c: path c class major minor mode owner group package ftype f: path f class mode owner group size cksum modtime package ftype x: path x class mode owner group package ftype v: path v class mode owner group size cksum modtime package ftype e: path e class mode owner group size cksum modtime package A significant distinction between old- and new-style entries is that the former do not begin with a slash (/) character, while the latter (new-style) always do. For example, the following are new-style entries: d none /dev SUNWcsd e passwd /etc/passwd SUNWcsr The following are new-style entries: /dev d none 0755 root sys SUNWcsr SUNWcsd /etc/passwd e passwd 0644 root sys 580 48299 1077177419 SUNWcsr The following are the descriptions of the fields in both old- and new-style entries. path The absolute path of the node being described. For ftype s (indicating a symbolic link) this is the indirect pointer (link) name. rpath The relative path to the real file or linked-to directory name. ftype A one-character field that indicates the entry type (see pkgmap(4)). class The installation class to which the file belongs (see pkgmap(4)). package The package associated with this entry. For ftype d (directory) more than one package can be present. mode The octal mode of the file (see pkgmap(4)). owner The owner of the file (see pkgmap(4)). group The group to which the file belongs (see pkgmap(4)). major The major device number (see pkgmap(4)). minor The minor device number (see pkgmap(4)). size The actual size of the file in bytes as reported by sum (see pkgmap(4)). cksum The checksum of the file contents (see pkgmap(4)). modtime The time of last modification (see pkgmap(4)). ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsr | +-----------------------------+-----------------------------+ |Interface Stability |Unstable | +-----------------------------+-----------------------------+ SEE ALSO
patchadd(1M), pkgadd(1M), pkgadm(1M), pkgchk(1M), pkgmap(4), attributes(5) NOTES
As shown above, the interface stability of /var/sadm/install/contents is Unstable (see attributes(5)). It is common practice to use this file in a read-only manner to determine which files belong to which packages installed on a system. While this file has been present for many releases of the Solaris operating system, it might not be present in future releases. The fully supported way to obtain information from the installed package database is through pkgchk(1M). It is highly recommended that you use pkgchk rather than relying on the contents file. SunOS 5.10 29 Jun 2004 contents(4)
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