ag（The silver search）的使用

一、软件介绍

ag又名The silver search是与grep类似的搜索软件。是使用c++实现，支持windows和linux。在搜索大量文件时速度明显优于grep。所以推荐平时可以结合grep使用。

二、下载地址

github源码地址：https://github.com/ggreer/the_silver_searcher

三、vim中集成ag

• 下载ag插件，https://github.com/rking/ag.vim
• 然后放入vim的插件目录下。
• 修改vim配置文件.vimrc 添加如下配置：  let g:ag_prg="ag.exe --column" 

四、ag使用方法

Usage: ag [OPTIONS] PATTERN [PATH]

  Recursively search for PATTERN in PATH.
  Like grep or ack, but faster.

Example:
  ag -i foo /bar/

Output Options:
     --ackmate            Print results in AckMate-parseable format
  -A --after [LINES]      Print lines before match (Default: 2)
  -B --before [LINES]     Print lines after match (Default: 2)
     --[no]break          Print newlines between matches in different files
                          (Enabled by default)
     --[no]color          Print color codes in results (Enabled by default)
     --color-line-number  Color codes for line numbers (Default: 1;33)
     --color-match        Color codes for result match numbers (Default: 30;43)
     --color-path         Color codes for path names (Default: 1;32)
     --column             Print column numbers in results
     --[no]heading
     --line-numbers       Print line numbers even for streams
  -C --context [LINES]    Print lines before and after matches (Default: 2)
     --[no]group          Same as --[no]break --[no]heading
  -g PATTERN              Print filenames matching PATTERN
  -l --files-with-matches Only print filenames that contain matches
                          (don't print the matching lines)
  -L --files-without-matches
                          Only print filenames that don't contain matches
     --no-numbers         Don't print line numbers
     --print-long-lines   Print matches on very long lines (Default: >2k characters)
     --stats              Print stats (files scanned, time taken, etc.)

Search Options:
  -a --all-types          Search all files (doesn't include hidden files
                          or patterns from ignore files)
  -D --debug              Ridiculous debugging (probably not useful)
     --depth NUM          Search up to NUM directories deep (Default: 25)
  -f --follow             Follow symlinks
  -G --file-search-regex  PATTERN Limit search to filenames matching PATTERN
     --hidden             Search hidden files (obeys .*ignore files)
  -i --ignore-case        Match case insensitively
     --ignore PATTERN     Ignore files/directories matching PATTERN
                          (literal file/directory names also allowed)
     --ignore-dir NAME    Alias for --ignore for compatibility with ack.
  -m --max-count NUM      Skip the rest of a file after NUM matches (Default: 10,000)
  -p --path-to-agignore STRING
                          Use .agignore file at STRING
  -Q --literal            Don't parse PATTERN as a regular expression
  -s --case-sensitive     Match case sensitively (Enabled by default)
  -S --smart-case         Match case insensitively unless PATTERN contains
                          uppercase characters
     --search-binary      Search binary files for matches
  -t --all-text           Search all text files (doesn't include hidden files)
  -u --unrestricted       Search all files (ignore .agignore, .gitignore, etc.;
                          searches binary and hidden files as well)
  -U --skip-vcs-ignores   Ignore VCS ignore files
                          (.gitignore, .hgignore, .svnignore; still obey .agignore)
  -v --invert-match
  -w --word-regexp        Only match whole words
  -z --search-zip         Search contents of compressed (e.g., gzip) files

五.使用场景

    在查日志的时候 -C选项特别适用。例：我们需要查找一个玩具登录之前之后发生了什么 登录关键字为login 则可以使用命令：

    ag -C3 login log.log

   这样可以看到登录前后的3行日志。