grep, sed, sort, awk use

1. Basic log viewer command

tail change -400f demo.log # 400 last lines of the log file monitoring equivalent tail -n 400 -f (- f parameters in real time)
 less demo.log # view the log files, support for up and down scrolling, search function
 uniq -c Demo. log # marks the line number of repeats, the value 1 will not be repeated

 

2. grep command is simple to use

Rules: grep [options] pattern ... [file] ...     (pattern is a regular expression)

grep  ' ERR ' appcrawler.log # ERR for any lines contained in the document appcrawler.log 

grep -C 'ERROR' appcrawler.log   # output file appcrawler .log find the number of lines in all the rows of ERROR packet 

 grep -v 'ERROR ' appcrawler .log # find free "ERROR" row

grep -o ' Order-fix.curr_id: \ ([0-9] \ + \) ' demo.log # -o option to extract only the order-fix.curr_id: xxx Content (rather than a whole line), and outputs to the screen

 

3. streamline the contents of the log sed

To extract the contents of the log file by replacing the command sed