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How do I assign the output of a command to a variable within a loop in bash?
Post 303033929 by sankasu on Sunday 14th of April 2019 05:26:36 PM
04-14-2019
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LEARN ABOUT NETBSD
readlink
READLINK(2) BSD System Calls Manual READLINK(2) NAME
readlink -- read value of a symbolic link LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <unistd.h> ssize_t readlink(const char * restrict path, char * restrict buf, size_t bufsiz); DESCRIPTION
readlink() places the contents of the symbolic link path in the buffer buf, which has size bufsiz. readlink() does not append a NUL charac- ter to buf. RETURN VALUES
The call returns the count of characters placed in the buffer if it succeeds, or a -1 if an error occurs, placing the error code in the global variable errno. EXAMPLES
A typical use is illustrated in the following piece of code which reads the contents of a symbolic link named /symbolic/link and stores them as null-terminated string: #include <limits.h> #include <unistd.h> char buf[PATH_MAX]; ssize_t len; if ((len = readlink("/symbolic/link", buf, sizeof(buf)-1)) == -1) error handling; buf[len] = ' '; ERRORS
readlink() will fail if: [ENOTDIR] A component of the path prefix is not a directory. [ENAMETOOLONG] A component of a pathname exceeded {NAME_MAX} characters, or an entire path name exceeded {PATH_MAX} characters. [ENOENT] The named file does not exist. [EACCES] Search permission is denied for a component of the path prefix. [ELOOP] Too many symbolic links were encountered in translating the pathname. [EINVAL] The named file is not a symbolic link. [EIO] An I/O error occurred while reading from the file system. [EFAULT] buf extends outside the process's allocated address space. SEE ALSO
lstat(2), stat(2), symlink(2), symlink(7) STANDARDS
The readlink() function conforms to IEEE Std 1003.1-2001 (``POSIX.1''). HISTORY
The readlink() function appeared in 4.2BSD. The type returned was changed from int to ssize_t in NetBSD 2.1. BSD
May 11, 2004 BSD