Files · READ-ONLY
Where am I?
pwd
Print the current working directory.
Linux Command Desk
Find a short command for an everyday support problem. These basics are public; complete Bash scripts and guided tools have separate access rules.
Read-only checks. Review paths and permissions. Nothing runs here. Commands target GNU/Linux; systemctl needs systemd and help/type examples target Bash. Package-manager and destructive commands are deliberately outside this first release.
24 commands
Files · READ-ONLY
List files including hidden names
ls -lah
Show entries, permissions and sizes in the current directory.
Files · READ-ONLY
Inspect a file
stat -- 'YOUR_FILE'
Replace YOUR_FILE with your path; show file metadata.
Files · READ-ONLY
Count lines in an export
wc -l -- 'YOUR_FILE'
Counts newline characters, not necessarily logical records.
Files · READ-ONLY
View first lines
head -n 20 -- 'YOUR_FILE'
Show the first 20 lines; output may contain private data.
Files · READ-ONLY
View last lines
tail -n 50 -- 'YOUR_FILE'
Show the last 50 lines without following the file.
Storage · READ-ONLY
Check disk capacity
df -h
Show filesystem space; available capacity depends on the filesystem.
Storage · READ-ONLY
Check inode capacity
df -i
Look for exhausted inodes even when free bytes remain.
Storage · READ-ONLY
Measure a folder
du -sh -- 'YOUR_FOLDER'
Read-only traversal; large folders can take time.
Storage · READ-ONLY
Show mounted filesystems
cat /proc/mounts
Linux mount details, including potentially sensitive paths.
Identity · READ-ONLY
Who is this session?
id
Show current user and groups, not another user’s access rights.
Identity · READ-ONLY
Current username
whoami
Show the effective username.
Shell · READ-ONLY
Check command resolution
type -a -- 'YOUR_COMMAND'
Bash: show aliases, functions and executable matches.
Shell · READ-ONLY
Check shell version
bash --version
Show the installed Bash version.
Shell · READ-ONLY
Show command help
help cd
Bash built-in help. Replace cd with another Bash built-in.
System · READ-ONLY
Current UTC time
date -u
Inspect UTC time; not a synchronisation health check.
System · READ-ONLY
Kernel release
uname -r
Show kernel release.
System · READ-ONLY
OS release
cat /etc/os-release
Common Linux distribution identification file.
System · READ-ONLY
Memory counters
cat /proc/meminfo
Linux kernel memory figures; free memory alone does not show pressure.
System · READ-ONLY
System uptime
cat /proc/uptime
Linux uptime and aggregate idle seconds.
Services · READ-ONLY
Failed system services
systemctl --failed --type=service --no-pager
Requires systemd; inspect failures without restarting.
Services · READ-ONLY
Inspect a service
systemctl status --no-pager -- 'YOUR_SERVICE'
Replace with an installed unit. Nonzero exit status can mean inactive or failed.
Services · READ-ONLY
List scheduled timers
systemctl list-timers --all --no-pager
Shows loaded timers; not all installed timer unit files.
Services · READ-ONLY
Check user service failures
systemctl --user --failed --no-pager
Run in the affected user session; needs a user service manager.
References: GNU Coreutils · GNU Bash · systemctl · Linux procfs