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...
Category
Linux / Bash
Solutions for permission errors, script failures, and common command-line troubleshooting on Linux.
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...
Linux systemd Service Fails to Start on Boot
A systemd service that starts fine manually but fails specifically during boot almost always means it's starting before something it actually depends on is...
Bash Script Works Manually But Fails in Cron
A script that works perfectly when you run it yourself but fails (often silently) under cron almost always comes down to environment differences — cron runs...
Bash Variable Not Persisting Between Script Lines
When a variable seems to reset or lose its value partway through a Bash script, the cause is almost always that part of the script — commonly a loop fed by a...
Kill Process Using a Specific Port on Linux
Freeing up a port that's already in use on Linux is a two-step process: first identify exactly which process is holding it, then kill that specific process —...
Linux "Too Many Open Files" Error Fix
The "too many open files" error means a process has hit the maximum number of file descriptors it's allowed to have open simultaneously — and while raising the...
"Permission Denied" Running .sh Script on Linux
"Permission denied" when trying to run a shell script almost always means the file itself isn't marked as executable — Linux requires explicit execute...