12-29-2016
How to compare previous and current item in for loop in bash?
Hey,
I am trying to compare formated login and logout dates from one user at a host which I have stored in a tmp directory in order to find out the total login time. I need to compare them in order to find overlapping intervals.
At first I tried to store each log in and logo date in an array but it doesn't work. Can anyone help me?
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LOGIN(3) BSD Library Functions Manual LOGIN(3)
NAME
login, logout, logwtmp -- login utility functions (DEPRECATED)
SYNOPSIS
#include <util.h>
void
login(struct utmp *ut);
int
logout(const char *line);
void
logwtmp(const char *line, const char *name, const char *host);
DESCRIPTION
The login(), logout(), and logwtmp() functions are DEPRECATED; use pututxline(3) instead.
These functions operate on the database of current users in /var/run/utmpx and the system log file. Superuser permission is required.
The login() function updates the /var/run/utmpx files with user information contained in ut (after converting to a struct utmpx, as described
in pututxline(3)).
The logout() function removes the entry from /var/run/utmpx corresponding to the device line.
The logwtmp() function adds an entry to the system log file. Since login() will add the appropriate entry during a login, logwtmp() is usu-
ally used for logouts.
RETURN VALUES
logout() returns non-zero if it was able to find and delete an entry for line, and zero if there is no entry for line in /var/run/utmpx.
However, there is no error indication due to lack of permissions.
FILES
/dev/*
/var/run/utmpx
SEE ALSO
pututxline(3), utmp(5), utmpx(5)
BSD
December 14, 1995 BSD