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AT.ALLOW(5) - Linux Programmer's Manual AT.ALLOW(5)

📛 NAME

at.allow, at.deny - determine who can submit jobs via at or batch

🚀 Quick Reference

Use Case	Command	Description
Check if at.allow exists	ls -l /etc/at.allow	🔍 Verify if user restriction via allow list is active
List allowed users	cat /etc/at.allow	📋 Show all users permitted to use at or batch
List denied users	cat /etc/at.deny	📋 Show all users explicitly prohibited from using at or batch
Check if a specific user is allowed	grep ^username$ /etc/at.allow	🔬 Confirm if a given user is in the allow list
Check if a specific user is denied	grep ^username$ /etc/at.deny	🔬 Confirm if a given user is in the deny list
Check default access policy	ls -l /etc/at.allow /etc/at.deny 2>/dev/null	📊 Determine which file controls access (allow wins if present)

📖 DESCRIPTION

The /etc/at.allow and /etc/at.deny files determine which user can submit commands for later execution via at(1) or batch(1).

The format of the files is a list of usernames, one on each line. Whitespace is not permitted.

• ✅ If the file /etc/at.allow exists, only usernames mentioned in it are allowed to use at.
• ✅ If /etc/at.allow does not exist, /etc/at.deny is checked, every username not mentioned in it is then allowed to use at.
• ✅ An empty /etc/at.deny means that every user may use at.
• ❌ If neither exists, only the superuser is allowed to use at.

🔗 SEE ALSO

• at(1)
• cron(8)
• crontab(1)
• atd(8)

Sep 1997                          AT.ALLOW(5)

AT.ALLOW(5) - Linux Programmer's Manual AT.ALLOW(5) 📛 NAME 🚀 Quick Reference 📖 DESCRIPTION 🔗 SEE ALSO