04-08-2019
I apologize for not getting back to you sooner. (I was distracted for a few days by other activities.)
Have you made any progress on resolving this problem?
These 2 Users Gave Thanks to Don Cragun For This Post:
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My input:
File_1:
2000_t
g1110.b1
abb.1
2001_t
g1111.b1
abb.2
abb.2
g1112.b1
abb.3
2002_t
.
.
File_2:
2000_t Ali england 135
abb.1 Zoe british 150
2001_t Ali england 305
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AT(1) General Commands Manual AT(1)
NAME
at - execute commands at a later time
SYNOPSIS
at time [ day ] [ file ]
DESCRIPTION
At squirrels away a copy of the named file (standard input default) to be used as input to sh(1) at a specified later time. A cd(1) com-
mand to the current directory is inserted at the beginning, followed by assignments to all environment variables. When the script is run,
it uses the user and group ID of the creator of the copy file.
The time is 1 to 4 digits, with an optional following `A', `P', `N' or `M' for AM, PM, noon or midnight. One and two digit numbers are
taken to be hours, three and four digits to be hours and minutes. If no letters follow the digits, a 24 hour clock time is understood.
The optional day is either (1) a month name followed by a day number, or (2) a day of the week; if the word `week' follows invocation is
moved seven days further off. Names of months and days may be recognizably truncated. Examples of legitimate commands are
at 8am jan 24
at 1530 fr week
At programs are executed by periodic execution of the command /usr/lib/atrun from cron(8). The granularity of at depends upon how often
atrun is executed.
Standard output or error output is lost unless redirected.
FILES
/usr/spool/at/yy.ddd.hhhh.uu
activity to be performed at hour hhhh of year day ddd of year yy. uu is a unique number.
/usr/spool/at/lasttimedone contains hhhh for last hour of activity.
/usr/spool/at/past directory of activities now in progress
/usr/lib/atrun program that executes activities that are due
pwd(1)
SEE ALSO
calendar(1), cron(8)
DIAGNOSTICS
Complains about various syntax errors and times out of range.
BUGS
Due to the granularity of the execution of /usr/lib/atrun, there may be bugs in scheduling things almost exactly 24 hours into the future.
AT(1)