StdOut log log real-time highlighting

Developing debug stdout log Logs for real-time highlighting

Highlight Display

In fact, the search for specific keywords to replace the ANSI escape code

1. Regular replacement,perl -pe 's/<pattern>;/<replacement>;/g'
2. egrepKeyword substitutionegrep "fatal|error|warning|info|debug" -A10 -B10 --color=auto

Perl's way to specify different keywords for different colors, egrep custom color estimation is cumbersome.

Practical testing with Linux pipelines

Create a text file

vim test.txt
Enter the following content:

errorxxxxbbbwrfatalinfodebugdkjkinfoerrorwarninginfoinfo

PERL-PE Regular Replacement keywords

cat test.txt  | perl -pe 's/(fatal)/\e[0;41;37m$1\e[0m/g; s/(error)/\e[1;31m$1\e[0m/g; s/(warning)/\e[1;33m$1\e[0m/g; s/(info)/\e[1;32m$1\e[0m/g; s/(debug)/\e[1;34m$1\e[0m/g; s/(wechat)/\e[1;35m$1\e[0m/g'

Effect:

Egrep

cat test.txt | egrep  "fatal|error|warning|info|debug" -A10 -B10 --color=auto

Effect:

stdout logProcessing

Let's take the golang procedure as an example

go test -v  | egrep "fatal|error|warning|info|debug" -A10 -B10  --color=autogo test -v | perl -pe 's/(fatal)/\e[0;41;37m$1\e[0m/g; s/(error)/\e[1;31m$1\e[0m/g; s/(warning)/\e[1;33m$1\e[0m/g; s/(info)/\e[1;32m$1\e[0m/g; s/(debug)/\e[1;34m$1\e[0m/g; s/(wechat)/\e[1;35m$1\e[0m/g'

go run main.go | ... deal with it as above. golangThere is a package github.com/fatih/color, you can directly in the program in such a sub-output, with a period of time, feel the log or only do the log thing, do not make a gaudy, to review log time, use these two ways to filter, or throw to ELKgo inside.

This does not map, with the tail -f -n 50 /usr/local/var/postgres/log/postgresql-2018-05-24_000000.log | egrep "STATEMENT|LOG" -A10 -B10 --color=auto same as with the above cat effect is the same.

Terminal Console Font Color

echo -e "\033[30m 黑色字 \033[0m"echo -e "\033[31m 红色字 \033[0m"echo -e "\033[32m 绿色字 \033[0m"echo -e "\033[33m 黄色字 \033[0m"echo -e "\033[34m 蓝色字 \033[0m"echo -e "\033[35m 紫色字 \033[0m"echo -e "\033[36m 天蓝字 \033[0m"echo -e "\033[37m 白色字 \033[0m" echo -e "\033[40;37m 黑底白字 \033[0m"echo -e "\033[41;37m 红底白字 \033[0m"echo -e "\033[42;37m 绿底白字 \033[0m"echo -e "\033[43;37m 黄底白字 \033[0m"echo -e "\033[44;37m 蓝底白字 \033[0m"echo -e "\033[45;37m 紫底白字 \033[0m"echo -e "\033[46;37m 天蓝底白字 \033[0m"echo -e "\033[47;30m 白底黑字 \033[0m"

Detailed Description:

\e[F;B;Om

\eThe escape character begins with ESC a ASCII decimal representation of the code, which is 27 equal to the octal representation 033 .

• \eOr \033 declares the beginning of the escape sequence
• [Start defining colors.
• FFor font color, numbering 30~37 ;
• BFor background color, numbering 40~47 .
• OFor special meaning code
• Their order is not related.
• mis a marker
• mThere is no space behind, it is defined by the color Word and background

Color table

    前景 背景颜色    -------------------------    30 40 黑色    31 41 红色    32 42 绿色    33 43 黄色    34 44 蓝色    35 45 洋红     36 46 青色    37 47 白色    特别代码意义    -------------------------    0 OFF    1 高亮显示    4 underline    5 闪烁    7 反白显示    8 不可见

Resources:

• Let the keywords in the log filter cool
• Console output Color control (color display in console mode)
• Summary of the usage of the Perl Express expressions