Difference between revisions of "Uid"
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UID stands for USER ID, it is a number usually starting at 0 (for [[root]]) and ending at 65535. It can go beyond in some unix like operating systems. | UID stands for USER ID, it is a number usually starting at 0 (for [[root]]) and ending at 65535. It can go beyond in some unix like operating systems. | ||
| + | |||
| + | Every user has a UID when they have a shell on a system. The 'id' command lets you see your USER ID | ||
| + | |||
| + | id | ||
| + | uid=1000(pjp) gid=1000(pjp) groups=1000(pjp), 0(wheel), 553(_saned) | ||
| + | |||
| + | In this case the User ID is 1000. The file that provides a mapping of username to user id is /etc/passwd and /etc/master.passwd in a BSD system (/etc/shadow on SVR4). Some | ||
| + | programs check the mapping between user and userid as in this case: | ||
| + | |||
| + | $ su | ||
| + | su: who are you? | ||
| + | francisco$ id | ||
| + | uid=1000 gid=1000(pjp) groups=1000(pjp), 0(wheel), 553(_saned) | ||
| + | |||
| + | Notice id doesn't map the userid to a username since I changed it in /etc/passwd. | ||
Latest revision as of 09:03, 30 May 2008
UID stands for USER ID, it is a number usually starting at 0 (for root) and ending at 65535. It can go beyond in some unix like operating systems.
Every user has a UID when they have a shell on a system. The 'id' command lets you see your USER ID
id uid=1000(pjp) gid=1000(pjp) groups=1000(pjp), 0(wheel), 553(_saned)
In this case the User ID is 1000. The file that provides a mapping of username to user id is /etc/passwd and /etc/master.passwd in a BSD system (/etc/shadow on SVR4). Some programs check the mapping between user and userid as in this case:
$ su su: who are you? francisco$ id uid=1000 gid=1000(pjp) groups=1000(pjp), 0(wheel), 553(_saned)
Notice id doesn't map the userid to a username since I changed it in /etc/passwd.
