Commands by chirel (0)

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perl one-liner to get the current week number
Not perl but shorter.

stringContains: Determining if a String Contains a Substring

Set file access control lists
The file myfile is owned by tom and has read and write permissions for tom. Group and other permissions are empty which make myfile readable and writable only by tom. setfacl enables user tom to give read permission to user john only. The command 'ls -l' shows a '+' sign telling us that file access control list has been setup for myfile.

Count Files in a Directory with Wildcards.
Remove the '-maxdepth 1' option if you want to count in directories as well

Get AWS temporary credentials ready to export based on a MFA virtual appliance
You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

find files beginning with filename* that do not include "string"
Inverse grep, to find files without the string

Convert "man page" to text file
You can convert any UNIX man page to .txt

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

Examine processes generating traffic on your website
I often have to google this so I put it here for quick reference.

List all PostgreSQL databases. Useful when doing backups


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