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Full Discussion: Cronjob
Top Forums UNIX for Beginners Questions & Answers Cronjob Post 303013925 by MadeInGermany on Friday 2nd of March 2018 04:53:57 AM
Old 03-02-2018
Set it to daily, and let the cron job skip every second time.
Example:
Code:
59 23 * * *  tf=/tmp/tf; if [ -d $tf ]; then rmdir $tf; /path/to/realcronjob; else mkdir $tf; fi

As root the protected /var/run/ is safer than /tmp/.
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mkdirp(3GEN)					     String Pattern-Matching Library Functions					      mkdirp(3GEN)

NAME
mkdirp, rmdirp - create or remove directories in a path SYNOPSIS
cc [ flag ... ] file ... -lgen [ library ... ] #include <libgen.h> int mkdirp(const char *path, mode_t mode); int rmdirp(char *dir, char *dir1); DESCRIPTION
The mkdirp() function creates all the missing directories in path with mode. See chmod(2) for the values of mode. The rmdirp() function removes directories in path dir. This removal begins at the end of the path and moves backward toward the root as far as possible. If an error occurs, the remaining path is stored in dir1. RETURN VALUES
If path already exists or if a needed directory cannot be created, mkdirp() returns -1 and sets errno to one of the error values listed for mkdir(2). It returns zero if all the directories are created. The rmdirp() function returns 0 if it is able to remove every directory in the path. It returns -2 if a ``.'' or ``..'' is in the path and -3 if an attempt is made to remove the current directory. Otherwise it returns -1. EXAMPLES
Example 1: Example of creating scratch directories. The following example creates scratch directories. /* create scratch directories */ if(mkdirp("/tmp/sub1/sub2/sub3", 0755) == -1) { fprintf(stderr, "cannot create directory"); exit(1); } chdir("/tmp/sub1/sub2/sub3"); . . . /* cleanup */ chdir("/tmp"); rmdirp("sub1/sub2/sub3"); ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
chmod(2), mkdir(2), rmdir(2), malloc(3C), attributes(5) NOTES
The mkdirp() function uses malloc(3C) to allocate temporary space for the string. SunOS 5.10 14 Oct 2003 mkdirp(3GEN)
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