-q, --quiet, --silent Quiet; do not write anything to standard output. Exit immediately with zero status if any match is found, even if an error was detected. Also see the-sor--no-messagesoption. (-q is specified by POSIX.) 专门适合编写脚本? -s, --no-messages Suppresserror messages...
Quiet; do not write anything to standard output. Exit immediately with zero status if any match is found, even if an error was detected. 即,-q 选项指定不打印任何内容到标准输出,即使遇到错误也不打印,只会返回命令执行的结果,如果匹配返回 0,否则返回非 0 值。 可以用 $? 来获取到这个返回值。
-o, --only-matching Print only the matched (non-empty) parts of a matching line, with each such part on a separate output line. -q, --quiet, --silent Quiet; do not write anything to standard output. Exit immediately with zero status if any match is found, even if an error was ...
separate output line. -q: 静默模式,不输出任何信息 -q, --quiet, --silent Quiet; do not write anything to standard output. Exit immediately with zero status if any match is found, even if an error was detected. Also see the -s or --no-messages option. (-q is specified by POSIX.) ...
grep - print lines matching a patterngrep [OPTIONS] PATTERN [FILE...] grep [OPTIONS] [-e PATTERN | -f FILE] [FILE...]
ls > file.list 运行ls命令,其标准输出又一次定向到名为file.list的文件。 3.不带缓冲的I/O 函数open、read、write、lseek以及close提供了不带缓冲的I/O。这些函数都使用文件描写叙述符。 实例 假设愿意从标准输入读,并向标准输出写,则图1-4中所看到的的程序可用于复制任一UNIX普通文件。
To report bugs,see node`Bugs' in`gawk.info',which is section `Reporting Problems and Bugs'inthe printed version.gawk is a pattern scanning and processing language.Bydefaultit reads standard input and writes standard output.Examples:gawk'{ sum += $1 }; END { print sum }'file ...
q 参数,本意是 Quiet; do not write anything to standard output. Exit immediately with zero status if any match is found, even if an error was detected. 中文意思为,安静模式,不打印任何标准输出。如果有匹配的内容则立即返回状态值0。 小应用 ...
-q, --quiet, --silent Quiet; do not write anything to standard output. Exit immediately with zero status if any match is found, even if an error was detected. Also see the -s or --no-messages option. (-q is specified by POSIX.) - Shubham Khatri 它不起作用。例如,如果我正在寻找...
If not, set # it to the current or parent directory, whichever one contains the test data.# Subsequently, we run most of the pcre2grep tests in the source directory so # that the file names in the output are always the same.if [ -z "$srcdir" -o ! -d "$srcdir/testdata" ...