This works, because less listens on stderr (a behavior that screen would not expect without the `|') when its stdin is not a tty. Less versions newer than 177 fail miserably here; good old pg still works. !:sed -n s/.*Error.*/\007/p Sends window output to both, the user and ...
如果指定了INPUT_FILE,OUTPUT_FILE 或 ERROR_FILE选项,其后的文件将会分别被附加到第一个进程的标准输入、最后一个进程的标准输出,或者所有进程的标准错误管道上。如果指定了OUTPUT_QUIET后者ERROR_QUIET选项,那么标准输出或标准错误的结果将会被静静的忽略掉。如果为同一个管道指定了多于一个的OUTPUT_*或ERROR_* 选项...
LCTT是“Linux中国”([https://linux.cn/](https://linux.cn/))的翻译组,负责从国外优秀媒体翻译Linux相关的技术、资讯、杂文等内容。 LCTT 是“Linux中国”([https://linux.cn/](https://linux.cn/))的翻译组,负责从国外优秀媒体翻译 Linux 相关的技术、资讯、杂文等内容。 LCTT已经拥有几百名活跃成员...
. If you really want to follow an "exec" with some other statement, you can use one of these styles to avoid the warning: exec ('foo') or print STDERR "couldn't exec foo: $!"; { exec ('foo') }; print STDERR "couldn't exec foo: $!"; If there is more than one argument...
Using "pack()" to extract the required sort key into a consistent string can be an efficient way to build a single string to compare, instead of using multiple sort keys, which makes it possible to use the standard, written in "c" and fast, perl "sort()" function on the output, ...
A perl v5.12.5 Last change: 2012-11-03 31 Perl Programmers Reference Guide PERLVAR(1) few other names are also exempt in these ways: ENV STDIN INC STDOUT ARGV STDERR ARGVOUT _ SIG In particular, the new special "${^_XYZ}" variables are always taken to be in package "main", ...
Error messages for command line options and parsing the .fetchmailrc file are still written to stderr, or to the specified log file. The --nosyslog option turns off use of syslog(3), assuming it's turned on in the ~/.fetchmailrc file. The -N or --nodetach option suppresses ...
Addresses "-" or "stdio:/dev/fd/1" depict standard output, which normally is the output channel for result texts. To prevent a fatal intermingling of ISO image and text messages, all result texts get redirected to stderr if -*dev "-" or "stdio:/dev/fd/1" is among the start ...
The file /var/log/xdm.log will contain error messages from xdm and anything output to stderr by Xsetup, Xstartup, Xses- sion or Xreset. When you have trouble getting xdm working, check this file to see if xdm has any clues to the trouble. OPTIONS All of these options, except -...
Functions like "print", "open", "seek", or the "<FH>" diamond operator will accept either a named filehandle or a scalar variable containing one: ($ifh, $ofh, $efh) = (*STDIN, *STDOUT, *STDERR); print $ofh "Type it: "; my $got = <$ifh> print $efh "What was that: ...