Linux 计算行数的命令

Linux下wc命令的使用
通过help命令可以看出wc的参数列表为：

Usage: wc [OPTION]... [FILE]...
  or:  wc [OPTION]... --files0-from=F
Print newline, word, and byte counts for each FILE, and a total line if
more than one FILE is specified.  With no FILE, or when FILE is -,
read standard input.  A word is a non-zero-length sequence of characters
delimited by white space.
The options below may be used to select which counts are printed, always in
the following order: newline, word, character, byte, maximum line length.
  -c, --bytes            print the byte counts
  -m, --chars            print the character counts
  -l, --lines            print the newline counts
      --files0-from=F    read input from the files specified by
                           NUL-terminated names in file F;
                           If F is - then read names from standard input
  -L, --max-line-length  print the length of the longest line
  -w, --words            print the word counts
      --help     display this help and exit
      --version  output version information and exit

这边主要介绍-l 参数可以很方便计算出行数。
例如查询某个文件中含有某个字符的行数：

grep -nir "a" test | wc -l

Test 测试文件内容大概为

ia
v
b
cs
xs
ads
acsd
eee
ss

查询结果为

3