1. vim 黏贴代码格式混乱
:set paste
2. crontab 修改默认编辑器
> select-editor
3. awk
# 输出特定列
$ awk '{print $1, $4}' test.txt
# 过滤记录
$ awk '$3==0 && $4=="LISTEN" {print $2} ' test.txt
# 保留表头
$ awk '$3==0 && $4=="LISTEN" || NR==1 ' test.txt
# 输出行号
$ awk '$3==0 && $6=="ESTABLISHED" || NR==1 {printf "%02s %s %-20s %-20s %s\n",NR, FNR, $4,$5,$6}' test.txt
# 字符串匹配
$ awk '$6 ~ /FIN|TIME/ || NR==1 {print NR,$4,$5,$6}' test.txt
# 从file文件中找出长度大于80的行
$ awk 'length>80' file
awk 脚本
# 查看数据
$ cat score.txt
Marry 2143 78 84 77
Jack 2321 66 78 45
Tom 2122 48 77 71
Mike 2537 87 97 95
Bob 2415 40 57 62
# 查看脚本
$ cat cal.awk
#!/bin/awk -f
#运行前
BEGIN {
math = 0
english = 0
computer = 0
printf "NAME NO. MATH ENGLISH COMPUTER TOTAL\n"
printf "---------------------------------------------\n"
}
#运行中
{
math+=$3
english+=$4
computer+=$5
printf "%-6s %-6s %4d %8d %8d %8d\n", $1, $2, $3,$4,$5, $3+$4+$5
}
#运行后
END {
printf "---------------------------------------------\n"
printf " TOTAL:%10d %8d %8d \n", math, english, computer
printf "AVERAGE:%10.2f %8.2f %8.2f\n", math/NR, english/NR, computer/NR
}
# 执行并查看结果
$ awk -f cal.awk score.txt
NAME NO. MATH ENGLISH COMPUTER TOTAL
---------------------------------------------
Marry 2143 78 84 77 239
Jack 2321 66 78 45 189
Tom 2122 48 77 71 196
Mike 2537 87 97 95 279
Bob 2415 40 57 62 159
---------------------------------------------
TOTAL: 319 393 350
AVERAGE: 63.80 78.60 70.00
4. sed
$ cat pets.txt
This is my cat
my cat's name is betty
This is my dog
my dog's name is frank
This is my fish
my fish's name is george
This is my goat
my goat's name is adam
# 将其中的 my 字符串替换为 test ，结果仅输出到控制台
$ sed "s/my/test/g" pets.txt
# 将内容重定向到其他文件
$ sed "s/my/test/g" pets.txt > test_pets.txt
# 直接修改文件内容
$ sed -i "s/my/test/g" pets.txt
# 在每一行最前面加点东西
$ sed 's/^/#/g' pets.txt
#This is my cat
# my cat's name is betty
#This is my dog
# my dog's name is frank
#This is my fish
# my fish's name is george
#This is my goat
# my goat's name is adam
# 在每一行最后面加点东西
$ sed 's/$/ --- /g' pets.txt
This is my cat ---
my cat's name is betty ---
This is my dog ---
my dog's name is frank ---
This is my fish ---
my fish's name is george ---
This is my goat ---
my goat's name is adam ---
正则表达式的一些最基本的东西：
^表示一行的开头。如：/^#/以#开头的匹配。$表示一行的结尾。如：/}$/以}结尾的匹配。\<表示词首。 如：\<abc表示以 abc 为首的詞。\>表示词尾。 如：abc\>表示以 abc 結尾的詞。.表示任何单个字符。*表示某个字符出现了0次或多次。[ ]字符集合。 如：[abc]表示匹配a或b或c，还有[a-zA-Z]表示匹配所有的26个字符。如果其中有^表示反，如[^a]表示非a的字符
5. Linux 相关设置
5.1 关闭系统警告
$ vim /etc/inputrc
＃set bell style none 找到并去掉 #
5.2 配置 Github
$ git config --global credential.helper store
