VAL(1P)

💖 VAL(1P) — the POSIX Programmer's Manual, but make it a group chat 💖

okay bestie, welcome to val from the POSIX Programmer's Manual (the 1P one, yes, the portable one). quick heads-up before we go any further:

🚨 PROLOG 🚨

This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ — so if you're on Linux, go check the corresponding Linux manual page for the deets on actual Linux behavior. Orrrr the interface might just not be implemented on Linux at all. 🙈 no cap.

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✨ NAME ✨

val — validate SCCS files (DEVELOPMENT). she's a little development-flavored icon, iykyk.

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🎀 SYNOPSIS 🎀

val -

val [-s] [-m name] [-r SID] [-y type] file...

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🦋 DESCRIPTION 🦋

So basically: val shall determine whether the specified file is an SCCS file that meets the characteristics specified by the options. that's it, that's the whole vibe. a vibe check for your SCCS files fr fr. 💅

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🌸 OPTIONS 🌸

val shall conform to the Base Definitions volume of POSIX.1‐2017, Section 12.2, Utility Syntax Guidelines — except that the usage of the - operand is not strictly as intended by the guidelines (like, reading options and operands from standard input). so she's a rule-follower who broke exactly one rule. main character energy.

The following options shall be supported:

• -m name — specify a name, which is compared with the SCCS %M% keyword in file; see get. matching names, slay.
• -r SID — specify a SID (SCCS Identification String), an SCCS delta number. A check shall be made to determine whether the SID is ambiguous (for example, -r 1 is ambiguous because it physically does not exist but implies 1.1, 1.2, and so on, which may exist) or invalid (for example, -r 1.0 or -r 1.1.0 are invalid because neither case can exist as a valid delta number). If the SID is valid and not ambiguous, a check shall be made to determine whether it actually exists. she's doing a full background check on your delta number, no shortcuts. 🔥
• -s — silence the diagnostic message normally written to standard output for any error that is detected while processing each named file on a given command line. quiet mode. shhh. 🤫
• -y type — specify a type, which shall be compared with the SCCS %Y% keyword in file; see get.

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🧚 OPERANDS 🧚

The following operands shall be supported:

• file — a pathname of an existing SCCS file. If exactly one file operand appears, and it is -, the standard input shall be read: each line shall be independently processed as if it were a command line argument list. (However, the line is not subjected to any of the shell word expansions, such as parameter expansion or quote removal.) so no, the shell is not doing cute little expansions on those lines. she reads them raw. periodt.

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💜 STDIN 💜

The standard input shall be a text file used only when the file operand is specified as -.

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🍓 INPUT FILES 🍓

Any SCCS files processed shall be files of an unspecified format. mysterious. we don't ask. we don't tell. 💀

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🌈 ENVIRONMENT VARIABLES 🌈

The following environment variables shall affect the execution of val:

• LANG — provide a default value for the internationalization variables that are unset or null. (See the Base Definitions volume of POSIX.1‐2017, Section 8.2, Internationalization Variables for the precedence of internationalization variables used to determine the values of locale categories.)
• LC_ALL — if set to a non-empty string value, override the values of all the other internationalization variables. she's the boss of the other locale variables, lowkey.
• LC_CTYPE — determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as opposed to multi-byte characters in arguments and input files).
• LC_MESSAGES — determine the locale that should be used to affect the format and contents of diagnostic messages written to standard error, and informative messages written to standard output.
• NLSPATH — determine the location of message catalogs for the processing of LC_MESSAGES.

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⭐ ASYNCHRONOUS EVENTS ⭐

Default. that's literally it. iconic brevity honestly.

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👑 STDOUT 👑

The standard output shall consist of informative messages about either:

1. Each file processed
2. Each command line read from standard input

If the standard input is not used, for each file operand yielding a discrepancy, the output line shall have the following format:

"%s: %s\n", <pathname>, <unspecified string>

If the standard input is used, for each input line yielding a discrepancy, the output shall have the following format:

"%s\n\n %s: %s\n", <input>, <pathname>, <unspecified string>

where <input> is the input line minus its terminating <newline>.

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💀 STDERR 💀

Not used. she doesn't yell at stderr. she simply does not. 🙈

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🎀 OUTPUT FILES 🎀

None.

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✨ EXTENDED DESCRIPTION ✨

None. (yes bestie, she really said "none". we move.)

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🔥 EXIT STATUS 🔥

The 8-bit code returned by val shall be a disjunction of the possible errors; that is, it can be interpreted as a bit string where set bits are interpreted as follows:

0x80   =   Missing file argument.
0x40   =   Unknown or duplicate option.
0x20   =   Corrupted SCCS file.
0x10   =   Cannot open file or file not SCCS.
0x08   =   SID is invalid or ambiguous.
0x04   =   SID does not exist.
0x02   =   %Y%, -y mismatch.
0x01   =   %M%, -m mismatch.

Note that val can process two or more files on a given command line and can process multiple command lines (when reading the standard input). In these cases an aggregate code shall be returned: a logical OR of the codes generated for each command line and file processed. bitwise bestie behavior, honestly so real of her. 💅

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😭 CONSEQUENCES OF ERRORS 😭

Default.

The following sections are informative.

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💖 APPLICATION USAGE 💖

Since the val exit status sets the 0x80 bit, shell applications checking "$?" cannot tell if it terminated due to a missing file argument or receipt of a signal. yeah. that's a real gotcha. write that down bestie. 📝

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🫶 EXAMPLES 🫶

In a directory with three SCCS files — s.x (of t type text), s.y, and s.z (a corrupted file) — the following command could produce the output shown:

val - <<EOF
-y source s.x
-m y s.y
s.z
EOF
-y source s.x

    s.x: %Y%, -y mismatch
s.z

    s.z: corrupted SCCS file

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🦄 RATIONALE 🦄

None.

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🌟 FUTURE DIRECTIONS 🌟

None.

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💜 SEE ALSO 💜

admin, delta, get, prs

The Base Definitions volume of POSIX.1‐2017, Chapter 8, Environment Variables, Section 12.2, Utility Syntax Guidelines

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📜 COPYRIGHT 📜

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

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and that's the whole page bestie!! brought to you by IEEE/The Open Group, 2017 — yeah, 2017, she's vintage, she's classic, she's still valid. go validate those SCCS files. mwah. 💖✨