linux查看命令利器-tldr
tldr：too long don't read的简称，相比man help只显示常用命令的用法，且比较简明易懂安装可用npm pip等，例如：pip install tldr
安装后可sudo tldr -u
比如要查awk常用命令，使用效果如下（该演示是linux环境，windows也可以安装）
www-data@rjyby07:~$ tldr awk
# awk
A versatile programming language for working on files.
More information: <https://github.com/onetrueawk/awk>.
- Print the fifth column (a.k.a. field) in a space-separated file:
awk '{print $5}' path/to/file
- Print the second column of the lines containing "foo" in a space-separated file:
awk '/foo/ {print $2}' path/to/file
- Print the last column of each line in a file, using a comma (instead of space) as a field separator:
awk -F ',' '{print $NF}' path/to/file
- Sum the values in the first column of a file and print the total:
awk '{s+=$1} END {print s}' path/to/file
- Print every third line starting from the first line:
awk 'NR%3==1' path/to/file
- Print different values based on conditions:
awk '{if ($1 == "foo") print "Exact match foo"; else if ($1 ~ "bar") print "Partial match bar"; else print "Baz"}' path/to/file
- Print all lines where the 10th column value equals the specified value:
awk '($10 == value)'
- Print all the lines which the 10th column value is between a min and a max:
awk '($10 >= min_value && $10 <= max_value)'
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