bash Archives - Page 2 of 2 - Sysadmins of the North

a rusted iron gate with a chain hanging from it

Codebase

Last updated: 2026-10-29

Test SMTP authentication and StartTLS

Investigate SMTP authentication issues like a boss! When using TLS encrypted SMTP connections, it's always handy if you are able to create a SMTP logon credentials and test SMTP authentication over a TLS/StartTLS connection. Preferably from your command-prompt.

GNU/Linux

Last updated: 2026-10-29

MySQL string comparison functions for MD5 and SHA1 hashes

MySQL string comparison functions for MD5 and SHA1 hashes; how to calculate MD5 and SHA1 hashes in MySQL and let MySQL do the calculations for you.

GNU/Linux

Last updated: 2026-06-21

Split Comma Separated Values (csv) fields with VIM or sed

Split a csv field into two fields using Vim and print or delete csv fields with AWK/Gawk (how to)

GNU/Linux

Last updated: 2026-10-09

Bash: Grep through a large number of files - "Argument list too long"

/bash/grep and /bash/rm give me an error Argument list too long. Here is how to overcome this error with Bash grep and rm.

GNU/Linux

Last updated: 2026-10-10

Check IP address blacklist status in Bash

Here is a Linux Bash shell script to check whether an IP address is listed in a DNSBL blacklist, or RBL. Using this script in Bash you can quickly test if an IP address is blacklisted.