Bash Script Fails With "$'\r': Command Not Found" (CRLF Line Endings)
The $'\r': command not found error is a strong, specific signal of Windows-style line endings (CRLF) in a script meant to run on Linux/Unix, which expects...
Category
Linux / Bash
Solutions for permission errors, script failures, and common command-line troubleshooting on Linux.
Bash set -e Not Exiting Script Inside Function or Subshell
set -e is meant to make a script exit immediately when any command fails, but its actual behavior has several well-documented, specific exceptions where a...
Linux Process Killed Automatically by System (Out of Memory)
A process that just stops running with no crash log, no error message, and no obvious cause is often a strong sign of the Linux kernel's OOM (Out of Memory)...
Linux SSH Connection Hangs on "Authenticating" or Drops Frequently
An SSH connection that hangs specifically during authentication, or that drops unexpectedly after connecting successfully, usually traces back to one of a...
Linux systemd Service Status "Degraded" After Restart
A system-wide "degraded" state in systemd means at least one unit (a service, a mount, a timer) failed to start or exited with an error — it's a summary...
Bash Heredoc Syntax Errors, Common Mistakes
Bash heredoc syntax errors almost always come down to a small set of recurring mistakes — trailing whitespace after the closing delimiter, unexpected variable...
Bash Script Hangs Waiting for Input in Cron
A script that runs perfectly when you execute it manually but hangs forever under cron almost always means something in the script is waiting for interactive...
Linux "Command Not Found" After Installing via apt
Getting "command not found" immediately after apt install reports success almost always means the installed binary isn't located in a directory your shell's...
Linux Disk Usage High But du Doesn't Show Why
When df reports a disk as nearly full, but adding up everything du finds doesn't come close to explaining the used space, the most common cause is a deleted...