介绍
在Linux系统中这统计非常方便,只需要简单的几个命令就可以搞定,这个命令就是 wc
。
wc --help 用法:wc [选项]... [文件]... 或:wc [选项]... --files0-from=F 输出每个指定文件的行数、单词计数和字节数,如果指定了 多于一个文件,继续给出所有相关数据的总计。如果没有指定 文件,或者文件为"-",则从标准输入读取数据。 -c, --bytes 输出字节数统计 -m, --chars 输出字符数统计 -l, --lines 输出行数统计 --files0-from=文件 从指定文件读取以NUL 终止的名称,如果该文件被 指定为"-"则从标准输入读文件名 -L, --max-line-length 显示最长行的长度 -w, --words 显示单词计数 --help 显示此帮助信息并退出 --version 显示版本信息并退出
使用实例
- 获取文件行数
wc -l app.log 30000 app.log
- 获取文件单词数
wc -w app.log 30000 app.log
- 获取文件字节数
wc -c app.log 3000 app.log
grep
查询文件的行数或字数只是个简单的需求场景,有时候我们其实是要获取多少匹配关键字的行数,那么这种情况如何实现呢,这种情况我们需要使用另外一个grep
命令来配置wc来完成我们的需求场景。
lennlouis@dpdk-vm:~$ grep --help Usage: grep [OPTION]... PATTERNS [FILE]... Search for PATTERNS in each FILE. Example: grep -i 'hello world' menu.h main.c PATTERNS can contain multiple patterns separated by newlines. Pattern selection and interpretation: -E, --extended-regexp PATTERNS are extended regular expressions -F, --fixed-strings PATTERNS are strings -G, --basic-regexp PATTERNS are basic regular expressions -P, --perl-regexp PATTERNS are Perl regular expressions -e, --regexp=PATTERNS use PATTERNS for matching -f, --file=FILE take PATTERNS from FILE -i, --ignore-case ignore case distinctions in patterns and data --no-ignore-case do not ignore case distinctions (default) -w, --word-regexp match only whole words -x, --line-regexp match only whole lines -z, --null-data a data line ends in 0 byte, not newline Miscellaneous: -s, --no-messages suppress error messages -v, --invert-match select non-matching lines -V, --version display version information and exit --help display this help text and exit Output control: -m, --max-count=NUM stop after NUM selected lines -b, --byte-offset print the byte offset with output lines -n, --line-number print line number with output lines --line-buffered flush output on every line -H, --with-filename print file name with output lines -h, --no-filename suppress the file name prefix on output --label=LABEL use LABEL as the standard input file name prefix -o, --only-matching show only nonempty parts of lines that match -q, --quiet, --silent suppress all normal output --binary-files=TYPE assume that binary files are TYPE; TYPE is 'binary', 'text', or 'without-match' -a, --text equivalent to --binary-files=text -I equivalent to --binary-files=without-match -d, --directories=ACTION how to handle directories; ACTION is 'read', 'recurse', or 'skip' -D, --devices=ACTION how to handle devices, FIFOs and sockets; ACTION is 'read' or 'skip' -r, --recursive like --directories=recurse -R, --dereference-recursive likewise, but follow all symlinks --include=GLOB search only files that match GLOB (a file pattern) --exclude=GLOB skip files that match GLOB --exclude-from=FILE skip files that match any file pattern from FILE --exclude-dir=GLOB skip directories that match GLOB -L, --files-without-match print only names of FILEs with no selected lines -l, --files-with-matches print only names of FILEs with selected lines -c, --count print only a count of selected lines per FILE -T, --initial-tab make tabs line up (if needed) -Z, --null print 0 byte after FILE name Context control: -B, --before-context=NUM print NUM lines of leading context -A, --after-context=NUM print NUM lines of trailing context -C, --context=NUM print NUM lines of output context -NUM same as --context=NUM --color[=WHEN], --colour[=WHEN] use markers to highlight the matching strings; WHEN is 'always', 'never', or 'auto' -U, --binary do not strip CR characters at EOL (MSDOS/Windows) When FILE is '-', read standard input. With no FILE, read '.' if recursive, '-' otherwise. With fewer than two FILEs, assume -h. Exit status is 0 if any line (or file if -L) is selected, 1 otherwise; if any error occurs and -q is not given, the exit status is 2. Report bugs to: bug-grep@gnu.org GNU grep home page: <http://www.gnu.org/software/grep/> General help using GNU software: <https://www.gnu.org/gethelp/>
- 查询文件中单词的行数
grep 'hello' app.log | wc -l