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File Permissions

A Unix mode as octal, rwx, and symbolic

Permissions
Mode bits
BitFileDirectory
rReadRead the contents.List the entries.
wWriteModify the contents.Create, remove and rename entries; requires x.
xExecuteExecute the file.Search: access entries by name.
sSetuidExecute with the owner’s user ID.Ignored.
sSetgidExecute with the group’s group ID.New entries inherit the directory’s group.
tStickyIgnored.Only an entry’s owner, the directory’s owner or root may remove or rename it.