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The batchfile handling might be self-explanatory, and for ssh's public key authentication there's many a thread in these fora. The links at bottom left under "More UNIX and Linux Forum Topics You...

As your directory names are suitably formatted, you can just use ls's inherent sort. Tryecho rm $(ls -1d 2018* | head -1) The echo is for testing / debugging only.


BTW, you mayhap don't need the...

This should work in newer bash and ksh.
Additional error handling should be done against utilities used against accounts.

#!/usr/bin/ksh
begin=0
i=0
nump=5 # number of accounts per processing,...

You should avoid changing the "test" file when cat could still be reading it, this will become evident if your input file is large and cat hasn't buffered the whole thing before the script starts...

You are removing lines from test inside the loop when it is also the input file for the loop. That is not right.
What version of ksh are you using ? If it is ksh88 then the substitutions will not...

Save as beyondfifty.pl
#!/usr/bin/perl
use strict;
use warnings;
use Time::Local;
use File::Copy qw(move);

my $locked = "lockedusers.txt";
my $keep = "$locked.tmp";

my $fifty_days_ago =...

and 86400 sec = 60 * 60 * 24 sec = 1 day
A - B > 0 is equal to A > B so you can do
while IFS="_ " read LUSER LDATE
do
if [ $(( $(date +%s) - $(date +%s -d"${LDATE:2:2}/${LDATE:0:2}/${LDATE:...

50 * 86400 sec = 4320000 sec