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48 Qshell Interpreter (qsh) 0010 execute/search by group 0004 read by others 0002 write by others 0001 execute/search by others The symbolic mode is described by the following grammar: v mode ::= clause [, clause ...] v clause ::= [who ...] [action ...] last_action v action ::= op [perm ...] v last_action ::= op [perm ...] v who::=a|u|g|o v op::=+|-|= v perm ::= r|w|x|X|u|g|o The who symbols “u”, “g”, and “o” specify the user, group, and other parts of the mode bits, respectively. The who symbol “a” is equivalent to “ugo”. The perm symbols represent the portions of the mode bits as follows: r The read bits. w The write bits. x The execute/search bits. X The execute/search bits if the file is a directory or any of the execute/search bits are set in the original (unmodified) mode. Operations with the perm symbol “X” are only meaningful in conjunction with the op symbol “+”, and are ignored in all other cases. u The user permission bits in the mode of the original file. g The group permission bits in the mode of the original file. o The other permission bits in the mode of the original file. The op symbols represent the operation performed, as follows: + If no value is supplied for perm, the “+” operation has no effect. If no value is supplied for who, each permission bit specified in perm, for which the corresponding bit in the file mode creation mask is clear, is set. Otherwise, the mode bits represented by the specified who and perm values are set. - If no value is supplied for perm, the “-” operation has no effect. If no value is supplied for who, each permission bit specified in perm, for which the corresponding bit in the file mode creation mask is clear, is cleared. Otherwise, the mode bits represented by the specified who and perm values are cleared. = The mode bits specified by the who value are cleared, or, if no who value is specified, the owner, group and other mode bits are cleared. Then, if no value is supplied for who, each permission bit specified in perm, for which the corresponding bit in the file mode creation mask is clear, is set. Otherwise, the mode bits represented by the specified who and perm values are set.
Exit Status Related Information Examples Each clause specifies one or more operations to be performed on the mode bits, and each operation is applied to the mode bits in the order specified. v 0 on success v >0 if an error occurs v chgrp - Change file group permission v chown - Change file ownership 1. Make a file readable by anyone and writable by the owner. chmod 644 foo 2. Deny write permission to the group and others. chmod go-w foo 3. Set the read and write permissions to the usual defaults, and retain any execute permissions that are currently set. chmod =rw,+X foo 4. Make a directory or file searchable/executable by everyone if it is already searchable/executable by anyone. chmod +X foo 5. Make a file readable/executable by everyone and writable by the owner only. chmod 755 foo 6. Clear all mode bits for the group and others. chmod go= foo 7. Set the group bits equal to the owner bits, but clear the group write bit. chmod g=u-w foo [ Legal | AS/400 Glossary ] chown - Change file ownership Synopsis Description chown [-R] Owner[:Group] {File ... | Directory ... } You can use chown to set the user identifier of the File or Directory operand to the user identifier specified by the Owner operand. Optionally, the chown command can also set the group identifier of the File or Directory operand to the group identifier specified by the Group operand. To change the owner or group identifier, you must have one of the following authorities: v The current user profile has *ALLOBJ special authority. Chapter 4. Utilities 49
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unset - Unset values of variables a
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Exit status v 0 when successful. [
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true - Return true value Synopsis D
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expr 10 = 10 [ Legal | AS/400 Gloss
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128 Qshell Interpreter (qsh) int c;
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130 Qshell Interpreter (qsh) } /* G
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