mktemp
mktemp功能说明：建立暂存文件。
语 法：mktemp [-qu][文件名参数]
补充说明：mktemp可建立一个暂存文件，供shell script使用。
参 数：
-q 执行时若发生错误，不会显示任何信息。
-u 暂存文件会在mktemp结束前先行删除。
[文件名参数] 文件名参数必须是以"自订名称.XXXXXX"的格式。
mktemp
mktemp [options] [template]
Generate a unique temporary filename for use in a script. The filename is based on the specified template, which may be any filename with at least six Xs appended (e.g., /tmp/mytemp.XXXXXX). mktemp replaces the Xs with the current process number and/or a unique letter combination. The file is created with mode 0600 (unless -u is specified), and the filename is written to standard output. With no template specified, the default file
Options
Make a directory, not a file.
Fail silently in case of error. Useful to prevent error output from being sent to standard error.
Generate the temporary file in the specified directory.
Generate a path to the file rooted in a temporary directory. The directory is taken from the TMPDIR environment variable if it is set, or from the -p option. If neither is set,
/tmp is used.
Operate in "unsafe" mode and unlink the temporary file before mktemp exits. Use of this option is not recommended.
Print version information and exit.