Typically PATTERNS should be quoted when grep is used in a shell command. A FILE of “-” stands for standard input. If no FILE is given, recursive searches examine the working directory, and nonrecursive searches read standard input. In addition, the variant programs egrep, fgrep and ...
--context=NUM print NUM lines of output context-NUM same as--context=NUM--group-separator=SEP use SEP as a group separator--no-group-separator use empty string as a group separator--color[=WHEN],--colour[=WHEN] use markers to highlight the matching...
read all files under each directory, recursively, following symbolic links only if they are on the command line. This is equivalent to the -r option. 如果输入文件是一个目录,则使用ACTION来处理它。默认情况下,读取操作,即就像读取普通文件一样读取目录。如果操作是跳过,则静默地跳过目录。如果动作是递归...
so that the alignment of tabs looks normal. This is useful with options that prefix their output to the actual content:-H,-n, and-b. In order to improve theprobabilitythatlines from a single file will all start at the same column, this also causes the line number...
grep (global search regular expression(RE) and print out the line,全面搜索正则表达式并把行打印出来)是一种强大的文本搜索工具,它能使用正则表达式搜索文本,并把匹配的行打印出来。Unix的grep家族包括grep、egrep和fgrep。egrep和fgrep的命令只跟grep有很小不同。egrep是grep的扩展,支持更多的re元字符,fgrep就是...
grep - print lines matching a patterngrep [OPTIONS] PATTERN [FILE...] grep [OPTIONS] [-e PATTERN | -f FILE] [FILE...]
Search for PATTERN in each FILE or standard input. PATTERN is, by default, a basic regular expression (BRE). Example: grep -i 'hello world' menu.h main.c Regexp selection and interpretation: -E, --extended-regexp PATTERN is an extended regular expression (ERE) ...
Basic Text Search This finds error messages in a log file. basic_search.sh grep "ERROR" /var/log/syslog Thegrepcommand searches/var/log/syslogfor lines containing "ERROR" and prints them. Case matters—only exact matches appear. Usecat /var/log/syslogto verify the file’s content first. ...
The grep command, in its most basic form, is a search tool. Unlike find or locate, it is not limited to finding file names; it is most often used to search the contents of a file for a particular string of text. As output, grep displays each full line of
In this guide, we will cover 14 grep command examples in Linux. Grep is a command line tool in Linux/Unix systems used to search text or string from a file.