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Test Your Knowledge in Computers #412
Difficulty: Medium
AT&T 3B computer systems included the 3B2, 3B5, 3B15, 3B20S, and 3B4000. These computers were named after the successful 3B20D. The 3B20S (simplex) ran using the UNIX operating system and was developed at Bell Labs and produced by WECo in 1982 for the general purpose internal Bell System use, and later the mini-computer market.
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chdir(3f) [bsd man page]

CHDIR(3F)																 CHDIR(3F)

chdir - change default directory SYNOPSIS
integer function chdir (dirname) character*(*) dirname DESCRIPTION
The default directory for creating and locating files will be changed to dirname. Zero is returned if successful; an error code otherwise. FILES
/usr/lib/libU77.a SEE ALSO
chdir(2), cd(1), perror(3F) BUGS
Pathnames can be no longer than MAXPATHLEN as defined in <sys/param.h>. Use of this function may cause inquire by unit to fail. 4.2 Berkeley Distribution May 15, 1985 CHDIR(3F)

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dirname(3C)						   Standard C Library Functions 					       dirname(3C)

dirname - report the parent directory name of a file path name SYNOPSIS
#include <libgen.h> char *dirname(char *path); DESCRIPTION
The dirname() function takes a pointer to a character string that contains a pathname, and returns a pointer to a string that is a pathname of the parent directory of that file. Trailing '/' characters in the path are not counted as part of the path. If path does not contain a '/', then dirname() returns a pointer to the string "." . If path is a null pointer or points to an empty string, dirname() returns a pointer to the string "." . RETURN VALUES
The dirname() function returns a pointer to a string that is the parent directory of path. If path is a null pointer or points to an empty string, a pointer to a string "." is returned. ERRORS
No errors are defined. EXAMPLES
Example 1: Changing the Current Directory to the Parent Directory. The following code fragment reads a pathname, changes the current working directory to the parent directory of the named file (see chdir(2)), and opens the file. char path[[MAXPATHLEN], *pathcopy; int fd; fgets(path, MAXPATHLEN, stdin); pathcopy = strdup(path); chdir(dirname(pathcopy)); fd = open(basename(path), O_RDONLY); Example 2: Sample Input and Output Strings for dirname(). In the following table, the input string is the value pointed to by path, and the output string is the return value of the dirname() func- tion. +-----------------------------+-----------------------------+ | Input String | Output String | +-----------------------------+-----------------------------+ |"/usr/lib"" |"/usr" | +-----------------------------+-----------------------------+ |"/usr/" |"/" | +-----------------------------+-----------------------------+ |"usr" |"/" | +-----------------------------+-----------------------------+ |"/" |"/" | +-----------------------------+-----------------------------+ |"." |"." | +-----------------------------+-----------------------------+ |".." |"." | +-----------------------------+-----------------------------+ USAGE
The dirname() function modifies the string pointed to by path. The dirname() and basename(3C) functions together yield a complete pathname. The expression dirname(path) obtains the pathname of the directory where basename(path) is found. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
basename(1), chdir(2), basename(3C), attributes(5), standards(5) SunOS 5.10 18 Mar 2002 dirname(3C)

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