There needs to be spaces between everything in expr. 3 -12 is invalid, 3 - 12 is okay.
That aside your script can be made a lot better in other ways. You don't need to be doing cut all the time to do simple string processing, that's really slow and difficult.
I am looking for the correct syntax on the expr command in UNIX. I have a script that I am building at the moment. the script is creating file1 that is an actual .sql file that is going inside the oracle database to get some information in there. It take that information, puts it inside another... (2 Replies)
Hello,
How do i translate datevalues in unix to normal dates.
and how do i translate normal dates in to datevalues.
I'm using the unix-date.
Sample:
1067949360 to 4-11-03 12:36
and
4-11-03 12:36 to 1067949360
I want to built a script with a question to the user: give in date... (4 Replies)
Hi I need to subtract one day from date1=`/bin/date +%d`
So I used
date=`/usr/ucb/expr $date1 - 1`
The only thing is if date1 is a single digit like 08, date will be 8 instead of 08.
How can I avoid losing 0?
Thanks for all your help!!! (4 Replies)
hi guys....
i hava a command expr... where i m adding a value in a loop
like
Tc=`expr $Tc\+ $l`
where
Tc is declred as a variable and every time l contains a new vaue
if
Tc =0 initially
and l =2
Tc should be equal to 0+ 2
and then
l = 4
Tc = 2+4
and dispaly as 6
but after... (5 Replies)
Hello,
what can I do to convert a decimal number (001-366) into the day of the year it represent in the format of mm-dd-yyyy ?
I know about the date +%j, it gives me the number for the current date, what about a reverse of this, is there such a thing?
My number resides in a var, what can I do to... (3 Replies)
Hi
Can anyone explain me the usage of this command and the arguments used here and what will be the expected output :
v_num=`expr nav_d_20100204_1759 : '*\(*\)'`
what will be the value returned in v_num.
Thanks in Advance!!!
Regards
Naveen Purbia (3 Replies)
I'm trying to check if a variable'd string is only one character and use that in an if statement the only way I could find is:
$expr "${var}" : . # expr STRING : regrep
where the "." is the grep wildcard for any single character.
Whats wrong with my code here and is there a... (3 Replies)
I am trying to read a txt file and trying to translate multiples spaces into single spaces so the file is more organized, but whenever I try the command:
tr ' ' ' ' w.txt
The output is:
tr: extra operand `w.txt'
Try `tr --help' for more information.
Can someone please help? :wall:
... (2 Replies)
Hello,
I have an input file contaning following data:
< 12345;5454;77;qwert< yuyuy;ruwuriwru> yyyw;
> 35353;68686;424242;hrjwhrwrwy< dgdgd;
I have first character as '<' or '>'and after that one space is their in each line
I just want to replace 1st space encountered after < or >... (3 Replies)
Discussion started by: abhi001cse
3 Replies
LEARN ABOUT BSD
getdate
GETDATE(3) Library Functions Manual GETDATE(3)NAME
getdate - convert time and date from ASCII
SYNOPSIS
#include <sys/types.h>
#include <sys/timeb.h>
time_t getdate(buf, now)
char *buf;
struct timeb *now;
DESCRIPTION
Getdate is a routine that converts most common time specifications to standard UNIX format. The first argument is the character string
containing the time and date; the second is the assumed current time (used for relative specifications); if NULL is passed, ftime(2) is
used to obtain the current time and timezone.
The character string consists of 0 or more specifications of the following form:
tod A tod is a time of day, which is of the form hh:mm[:ss] (or hhmm) [meridian] [zone]. If no meridian - am or pm - is specified, a
24-hour clock is used. A tod may be specified as just hh followed by a meridian.
date A date is a specific month and day, and possibly a year. Acceptable formats are mm/dd[/yy] and monthname dd[, yy] If omitted, the
year defaults to the current year; if a year is specified as a number less than 100, 1900 is added. If a number not followed by a
day or relative time unit occurs, it will be interpreted as a year if a tod, monthname, and dd have already been specified; other-
wise, it will be treated as a tod. This rule allows the output from date(1) or ctime(3) to be passed as input to getdate.
day A day of the week may be specified; the current day will be used if appropriate. A day may be preceeded by a number, indicating
which instance of that day is desired; the default is 1. Negative numbers indicate times past. Some symbolic numbers are accepted:
last, next, and the ordinals first through twelfth (second is ambiguous, and is not accepted as an ordinal number). The symbolic
number next is equivalent to 2; thus, next monday refers not to the immediately coming Monday, but to the one a week later.
relative time
Specifications relative to the current time are also accepted. The format is [number] unit; acceptable units are year, month, fort-
night, week, day, hour, minute, and second.
The actual date is formed as follows: first, any absolute date and/or time is processed and converted. Using that time as the base, day-
of-week specifications are added; last, relative specifications are used. If a date or day is specified, and no absolute or relative time
is given, midnight is used. Finally, a correction is applied so that the correct hour of the day is produced after allowing for daylight
savings time differences.
Getdate accepts most common abbreviations for days, months, etc.; in particular, it will recognize them with upper or lower case first let-
ter, and will recognize three-letter abbreviations for any of them, with or without a trailing period. Units, such as weeks, may be speci-
fied in the singular or plural. Timezone and meridian values may be in upper or lower case, and with or without periods.
FILES
/usr/lib/libu.a
SEE ALSO ctime(3), time(2)AUTHOR
Steven M. Bellovin (unc!smb)
Dept. of Computer Science
University of North Carolina at Chapel Hill
BUGS
Because yacc(1) is used to parse the date, getdate cannot be used a subroutine to any program that also needs yacc.
The grammar and scanner are rather primitive; certain desirable and unambiguous constructions are not accepted. Worse yet, the meaning of
some legal phrases is not what is expected; next week is identical to 2 weeks.
The daylight savings time correction is not perfect, and can get confused if handed times between midnight and 2:00 am on the days that the
reckoning changes.
Because localtime(2) accepts an old-style time format without zone information, attempting to pass getdate a current time containing a dif-
ferent zone will probably fail.
unc GETDATE(3)