--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 strings; WHEN is 'always',...
-n, --line-number Prefix each line of output with the 1-based line number within its input file. -o, --only-matching Print only the matched (non-empty) parts of a matching line, with each such part on a separate output line. -v, --invert-match Invert the sense of matching, to ...
sed -e 's/input/output/' my_file 1. 这会将my_file里的每一行第一个'input'替换为'output',并打印到标准输出。注意,sed 是面向行的,所以如果你希望改变每一个'input',需要使用贪婪(greedy)模式,像这样: sed -e 's/input/output/g' my_file 1. 在/.../中的内容可以是字符串文本或者正则表达式。
-h, --no-filename Suppress the prefixing of file names on output. This is the default when there is only one file (or only standard input) to search. --label=LABEL Display input actually coming from standard input as input coming from file LABEL. This can be useful for commands that...
-D,--dired generate output designedforEmacs' dired mode 正则表达式概述 虽然简单的模式匹配对于某些过滤任务已经足够,但grep真正的强大之处在于它能够使用正则表达式进行复杂的模式匹配。正则表达式中的大多数字符与字面上的输入数据匹配; 但是,有一些序列具有特殊意义: ...
-h, --no-filename Suppress the prefixing of file names on output. This is the default when there is only one file (or only standard input) to search. --label=LABEL Display inputactually coming from standard inputas inputcoming from fileLABEL. This is especiallyuseful for toolslike zgrep,...
输入set number或set nu，然后按Enter。 :set number 行号将显示在屏幕的左侧： 要禁用 ...
grep - print lines matching a patterngrep [OPTIONS] PATTERN [FILE...] grep [OPTIONS] [-e PATTERN | -f FILE] [FILE...]
输入一个字符串,对字符串中的数字进行求和 代码: package cn.tedu.string; public class StringText2 { public static void main(String[] args) { //字符串对象 String str=“erhg2309wefb4521”; //求和变量 int sum=0; //遍历字符串 for(int i=0;i<str.length......
; group = job.getInt("mapred.mapper.regex.group",0); word = context.createMapOutputKeyRecord(); one = context.createMapOutputValueRecord(); one.set(newObject[] {1L}); }@Overridepublicvoidmap(longrecordNum, Record record, TaskContext context)throwsIOException {for(inti=0; i < record....