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1.1 ! root 1: ! 2: ! 3: passwd File Format passwd ! 4: ! 5: ! 6: ! 7: ! 8: Password file format ! 9: ! 10: ! 11: The file /etc/passwd holds information about each user who has ! 12: permission to use the COHERENT system. This information is read ! 13: by the commands login and passwd whenever a user attempts to log ! 14: in, to ensure that that user is really himself and not an impos- ! 15: tor. ! 16: ! 17: /etc/passwd holds one record for each user; each record, in turn, ! 18: consists of seven colon-separated fields, as follows: ! 19: ! 20: ! 21: name:password:user_id:group_id:comments:home_dir:shell ! 22: ! 23: ! 24: name is the user's login name. password is his encrypted ! 25: password. user_id is a unique number that is also used to iden- ! 26: tify the user. group_id identifies the group to which the user ! 27: belongs, if any. comments holds miscellaneous data, such as ! 28: names, telephone numbers, or office numbers. home_dir gives the ! 29: user's home directory. Finally, shell gives the program that is ! 30: first executed when the user logs on; in most instances, this is ! 31: an interactive shell (default, /bbiinn/sshh). ! 32: ! 33: /etc/passwd includes a special entry for remacc. This entry con- ! 34: trols access to the system by remote devices (for example, by a ! 35: modem). If an entry in file /etc/ttys indicates that a serial ! 36: line is remote (as set by placing an `r' as the second character ! 37: in its entry), COHERENT prompts ! 38: ! 39: ! 40: Remote access password: ! 41: ! 42: ! 43: when a user attempts to log in on that line. ! 44: ! 45: To set the password for remacc, enter the following command while ! 46: running as the superuser. ! 47: ! 48: ! 49: passwd remacc ! 50: ! 51: ! 52: ***** See Also ***** ! 53: ! 54: file formats, passwd (command) ! 55: ! 56: ***** Notes ***** ! 57: ! 58: /etc/passwd can be read by anyone: if access to it were refused ! 59: to a user, he could not log on. Thus, the passwords encrypted ! 60: within it can be read and copied by anyone, and so may be vulner- ! 61: able to brute-force decryption. For this reason, close attention ! 62: ! 63: ! 64: COHERENT Lexicon Page 1 ! 65: ! 66: ! 67: ! 68: ! 69: passwd File Format passwd ! 70: ! 71: ! 72: ! 73: should be paid to passwords: they should not be common words or ! 74: names, preferably mix cases or use unique spellings, and be at ! 75: least six characters long. ! 76: ! 77: ! 78: ! 79: ! 80: ! 81: ! 82: ! 83: ! 84: ! 85: ! 86: ! 87: ! 88: ! 89: ! 90: ! 91: ! 92: ! 93: ! 94: ! 95: ! 96: ! 97: ! 98: ! 99: ! 100: ! 101: ! 102: ! 103: ! 104: ! 105: ! 106: ! 107: ! 108: ! 109: ! 110: ! 111: ! 112: ! 113: ! 114: ! 115: ! 116: ! 117: ! 118: ! 119: ! 120: ! 121: ! 122: ! 123: ! 124: ! 125: ! 126: ! 127: ! 128: ! 129: ! 130: COHERENT Lexicon Page 2 ! 131: ! 132:
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