Bash

Posts with category: bash

• Microtime in bash: sub-second precision • 15 Dec 2022
  Post #8 in this bash benchmark series, measuring the speed of common bash operations.
• Benchmark: hash functions • 19 Apr 2022
  Post #7 in this bash benchmark series, measuring the speed of common bash text manipulations.
• Benchmark: MacOS tr vs GNU gtr • 18 Apr 2022
  Post #6 in this bash benchmark series, measuring the speed of common bash text manipulations.
• Benchmark: slugify text in Bash • 15 Apr 2022
  Post #5 in this bash benchmark series, measuring the speed of common bash text manipulations.
• Benchmark: romanization in bash • 08 Apr 2022
  Post #4 in this bash benchmark series, measuring the speed of common bash text manipulations.
• Benchmark: trimming whitespace in bash • 25 Mar 2022
  Post #3 in this bash benchmark series, measuring the speed of common bash text manipulations.
• Benchmark: lowercase conversion in bash • 25 Mar 2022
  Post #2 in this bash benchmark series, measuring the speed of common bash text manipulations.
• Benchmark: cut characters in bash • 25 Mar 2022
  Post #1 in this bash benchmark series, measuring the speed of common bash text manipulations.
• Calculate hit rate from a log file • 21 Oct 2004
  You have a huge file that contains one line per request/transaction. Some lines are of one type (e.g. ‘HIT’), some of another (e.g. MISS). Let’s say you want to calculate the hit-rate, but as fast as possible. We take a Squid log file of about 140MB. How long does it take to count how many lines it has? $ time wc -l /var/log/squid/access.log 845212 /var/log/squid/access.log real 0m6.523s (about 21.4 MB/s or 130.000 lines/s)