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.TH PATHCHK 1 "Feb 1, 1995"
.SH NAME
pathchk \- check path names
.SH SYNOPSIS
.LP
.nf
\fBpathchk\fR [\fB-p\fR] \fIpath\fR...
.fi

.SH DESCRIPTION
.sp
.LP
The \fBpathchk\fR command will check that one or more path names are valid
(that is, they could be used to access or create a file without causing syntax
errors) and portable (that is, no filename truncation will result). More
extensive portability checks are provided by the \fB-p\fR option.
.sp
.LP
By default, \fBpathchk\fR will check each component of each \fIpath\fR operand
based on the underlying file system. A diagnostic will be written for each
\fIpath\fR operand that:
.RS +4
.TP
.ie t \(bu
.el o
is longer than \fIPATH_MAX\fR bytes.
.RE
.RS +4
.TP
.ie t \(bu
.el o
contains any component longer than \fINAME_MAX\fR bytes in its containing
directory
.RE
.RS +4
.TP
.ie t \(bu
.el o
contains any component in a directory that is not searchable
.RE
.RS +4
.TP
.ie t \(bu
.el o
contains any character in any component that is not valid in its containing
directory.
.RE
.sp
.LP
The format of the diagnostic message is not specified, but will indicate the
error detected and the corresponding \fIpath\fR operand.
.sp
.LP
It will not be considered an error if one or more components of a \fIpath\fR
operand do not exist as long as a file matching the path name specified by the
missing components could be created that does not violate any of the checks
specified above.
.SH OPTIONS
.sp
.LP
The following option is supported:
.sp
.ne 2
.na
\fB\fB-p\fR\fR
.ad
.RS 6n
Instead of performing checks based on the underlying file system, write a
diagnostic for each \fIpath\fR operand that:
.RS +4
.TP
.ie t \(bu
.el o
is longer than \fB_POSIX_PATH_MAX \fR bytes
.RE
.RS +4
.TP
.ie t \(bu
.el o
contains any component longer than \fB_POSIX_NAME_MAX\fR bytes
.RE
.RS +4
.TP
.ie t \(bu
.el o
contains any character in any component that is not in the portable filename
character set.
.RE
.RE

.SH OPERANDS
.sp
.LP
The following operand is supported:
.sp
.ne 2
.na
\fB\fIpath\fR\fR
.ad
.RS 8n
A path to be checked.
.RE

.SH USAGE
.sp
.LP
See \fBlargefile\fR(5) for the description of the behavior of \fBpathchk\fR
when encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).
.SH EXAMPLES
.LP
\fBExample 1 \fRUsing the pathchk command
.sp
.LP
To verify that all paths in an imported data interchange archive are legitimate
and unambiguous on the current system:

.sp
.in +2
.nf
example% \fBpax -f archive | sed -e '/ == .*/s///' | xargs pathchk
if [ $? -eq 0 ]
then
        pax -r -f archive
else
	echo Investigate problems before importing files.
	exit 1
fi\fR
.fi
.in -2
.sp

.sp
.LP
To verify that all files in the current directory hierarchy could be moved to
any system conforming to the X/Open specification that also  supports the
\fBpax\fR(1) command:

.sp
.in +2
.nf
example% \fBfind . -print | xargs pathchk -p
if [ $? \(mieq 0 ]
then
        pax -w -f archive .
else
	echo Portable archive cannot be created.
	exit 1
fi\fR
.fi
.in -2
.sp

.sp
.LP
To verify that a user-supplied path names a readable file and that the
application can create a file extending the given path without truncation and
without overwriting any existing file:

.sp
.in +2
.nf
example% \fBcase $- in
	*C*)    reset="";;
	*)      reset="set +C"
		set -C;;
esac
test -r "$path" && pathchk "$path.out" &&
	rm "$path.out" > "$path.out"
if [ $? -ne 0 ]; then
	printf "%s: %s not found or %s.out fails \e
creation checks.\en" $0 "$path" "$path"
	$reset	# reset the noclobber option in case a trap
		# on EXIT depends on it
	exit 1
fi
$reset
PROCESSING < "$path" > "$path.out"\fR
.fi
.in -2
.sp

.sp
.LP
The following assumptions are made in this example:

.RS +4
.TP
1.
\fBPROCESSING\fR represents the code that will be used by the application to
use \fB$path\fR once it is verified that \fB$path.out\fR will work as intended.
.RE
.RS +4
.TP
2.
The state of the \fBnoclobber\fR option is unknown when this code is invoked
and should be set on exit to the state it was in when this code was invoked.
(The \fBreset\fR variable is used in this example to restore the initial
state.)
.RE
.RS +4
.TP
3.
Note the usage of:
.sp
.in +2
.nf
\fBrm "$path.out" > "$path.out"\fR
.fi
.in -2
.sp

.sp
.ne 2
.na
\fBa.\fR
.ad
.RS 6n
The \fBpathchk\fR command has already verified, at this point, that
\fB$path.out\fR will not be truncated.
.RE

.sp
.ne 2
.na
\fBb.\fR
.ad
.RS 6n
With the \fBnoclobber\fR option set, the shell will verify that \fB$path.out\fR
does not already exist before invoking \fBrm\fR.
.RE

.sp
.ne 2
.na
\fBc.\fR
.ad
.RS 6n
If the shell succeeded in creating \fB$path.out\fR, \fBrm\fR will remove it so
that the application can create the file again in the \fBPROCESSING\fR step.
.RE

.sp
.ne 2
.na
\fBd.\fR
.ad
.RS 6n
If the \fBPROCESSING\fR step wants the file to exist already when it is
invoked, the:
.sp
.in +2
.nf
\fBrm "$path.out" > "$path.out"\fR
.fi
.in -2
.sp

should be replaced with:
.sp
.in +2
.nf
\fB> "$path.out"\fR
.fi
.in -2
.sp

which will verify that the file did not already exist, but leave
\fB$path.out\fR in place for use by \fBPROCESSING\fR.
.RE

.RE
.SH ENVIRONMENT VARIABLES
.sp
.LP
See \fBenviron\fR(5) for descriptions of the following environment variables
that affect the execution of \fBpathchk\fR: \fBLANG\fR, \fBLC_ALL\fR,
\fBLC_CTYPE\fR, \fBLC_MESSAGES\fR, and \fBNLSPATH\fR.
.SH EXIT STATUS
.sp
.LP
The following exit values are returned:
.sp
.ne 2
.na
\fB\fB0\fR\fR
.ad
.RS 6n
All \fIpath\fR operands passed all of the checks.
.RE

.sp
.ne 2
.na
\fB\fB>0\fR\fR
.ad
.RS 6n
An error occurred.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Standard
.TE

.SH SEE ALSO
.sp
.LP
\fBpax\fR(1), \fBtest\fR(1), \fBattributes\fR(5), \fBenviron\fR(5),
\fBlargefile\fR(5), \fBstandards\fR(5)