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手册页第 1 部分:用户命令     Oracle Solaris 11.1 Information Library (简体中文)
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pathchk

- check path names

用法概要

pathchk [-p] path...

描述

The pathchk 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 -p option.

By default, pathchk will check each component of each path operand based on the underlying file system. A diagnostic will be written for each path operand that:

The format of the diagnostic message is not specified, but will indicate the error detected and the corresponding path operand.

It will not be considered an error if one or more components of a path 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.

选项

The following option is supported:

-p

Instead of performing checks based on the underlying file system, write a diagnostic for each path operand that:

  • is longer than _POSIX_PATH_MAX bytes

  • contains any component longer than _POSIX_NAME_MAX bytes

  • contains any character in any component that is not in the portable filename character set.

操作数

The following operand is supported:

path

A path to be checked.

用法

See largefile(5) for the description of the behavior of pathchk when encountering files greater than or equal to 2 Gbyte ( 231 bytes).

示例

示例 1 Using the pathchk command

To verify that all paths in an imported data interchange archive are legitimate and unambiguous on the current system:

example% pax -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

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 pax(1) command:

example% find . -print | xargs pathchk -p
if [ $? -eq 0 ]
then
        pax -w -f archive .
else
    echo Portable archive cannot be created.
    exit 1
fi

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:

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

The following assumptions are made in this example:

  1. PROCESSING represents the code that will be used by the application to use $path once it is verified that $path.out will work as intended.

  2. The state of the noclobber 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 reset variable is used in this example to restore the initial state.)

  3. Note the usage of:

    rm "$path.out" > "$path.out"
    a.

    The pathchk command has already verified, at this point, that $path.out will not be truncated.

    b.

    With the noclobber option set, the shell will verify that $path.out does not already exist before invoking rm.

    c.

    If the shell succeeded in creating $path.out, rm will remove it so that the application can create the file again in the PROCESSING step.

    d.

    If the PROCESSING step wants the file to exist already when it is invoked, the:

    rm "$path.out" > "$path.out"

    should be replaced with:

    > "$path.out"

    which will verify that the file did not already exist, but leave $path.out in place for use by PROCESSING.

环境变量

See environ(5) for descriptions of the following environment variables that affect the execution of pathchk: LANG, LC_ALL, LC_CTYPE, LC_MESSAGES, and NLSPATH.

退出状态

The following exit values are returned:

0

All path operands passed all of the checks.

>0

An error occurred.

属性

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE
ATTRIBUTE VALUE
Availability
system/core-os
Interface Stability
Committed
Standard

另请参见

pax(1), test(1), attributes(5), environ(5), largefile(5), standards(5)