Post#13
by Kulle » 20 Mar 2024, 18:47
Bash programming is extremely powerful,
but I know very little.
I've never used awk before
AI is often very helpful
Explanation by AI (chatGPT):
This bash script is short and may be difficult to understand for someone unfamiliar with bash scripting. Let's break it down step by step:
#!/bin/bash: This is known as a shebang line and is used to specify the interpreter to be used for the script, in this case, bash.
cal -y $1: This command prints a calendar for the specified year, which is provided as a argument $1 when running the script. The -y option specifies the year.
|: This is called a pipe and is used to pass the output of one command as input to another command.
awk '{print $5" "$12" "$19}': This awk command extracts specific columns from the output of the cal command. It prints the 5th, 12th, and 19th columns separated by spaces.
|grep -o 13: This grep command searches for the number 13 in the output of the previous command. The -o option tells grep to only print the matching parts of a line, in this case, 13.
|wc -l: Finally, the output of the grep command is piped to wc -l, which counts the number of lines in the input. This effectively counts the occurrences of the number 13 in the output of the cal command.
In summary, this script takes a year as an argument, prints a calendar for that year, extracts specific columns, searches for the number 13 in the extracted columns, and counts the number of occurrences of 13. The final result is the number of occurrences of the number 13 in the calendar for the specified year.