01-19-2009
Multiple echos and cuts too slow
Hi guys, hopefully this hasn't been asked before - couldn't see the question anywhere.
I have a large number of timestamps (hh-mm-ss-millisecond)
that I need to find the difference between e.g.:
14-11-07-513
14-11-07-644
Now the script that I have just knocked up is horrifically slow, the crux of which is converting the hh, mm, dd into milliseconds:
(( TOTALTIMESTART= (`echo $var | cut -d'-' -f4-8 | cut -d'<' -f1 | cut -c1,2` * 3600000) + \
(`echo $var | cut -d'-' -f4-8 | cut -d'<' -f1 | cut -c4,5` * 60000) + \
(`echo $var | cut -d'-' -f4-8 | cut -d'<' -f1 | cut -c7,8` * 1000) + \
(`echo $var | cut -d'-' -f4-8 | cut -d'<' -f1 | cut -c10,11,12`) ))
Once done on two values it subtracts them from each other and usese the difference.
There is obviously a better way of doing the part above, but I can't think for the life of me what it would be.
Any thoughts?
7 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hi All,
I need some help with multiple cut and paste, at the moment I have a shell script that uses the following cuts ( this is just some)
cut -c1-92 WAITING > col1 .....etc etc etc
cut -c93-98 WAITING > col17 # blank_spaces
cut -c99-104 WAITING > col18 # Date
cut -c105... (12 Replies)
Discussion started by: Gerry405
12 Replies
2. UNIX for Advanced & Expert Users
Hi Guys. First of all Im not keen on os stuff, thus not sure what I should look for to solve my problem, Thats why Im posting before getting deeper into forums.
Here is my problem. Im working on academic network - Solaris 7-10. Where parts of configuration is made by students (Im still one).... (1 Reply)
Discussion started by: baranowb
1 Replies
3. Solaris
Hello,
I had created a shortcut to open up a gnome-terminal by pressing <Alt>m. This worked fine, until I logged out and logged back in. gnome-terminal no longer opens. However, the process is created, as evidenced by the gnome-terminal showing up on my process list.
I've created and deleted... (1 Reply)
Discussion started by: cooldude
1 Replies
4. UNIX for Dummies Questions & Answers
Hello
Yes I'm a noob so thanks for your help.
I have a unix exicutable that renders video under os x (unix). As it renders frames it echos (or outputs) information to the terminal about which frame it's up too an how long it took etc. I am looking for a way to pipe this information so I can... (4 Replies)
Discussion started by: mortocks
4 Replies
5. UNIX Desktop Questions & Answers
I would like to write a script that would remove and/or create shortcuts in Gnome desktop in RHEL 6.3...
I googled all over the place could never find what I needed...
Any help would be greatly appreciated!
Thank you! (0 Replies)
Discussion started by: ruberked
0 Replies
6. Shell Programming and Scripting
I wasn't sure if this should go in the networking board or not, since I am trying to log into routers, however I don't think my script issues have anything to do with the routers themselves....
I am trying to write a script that will log into various routers we have on the network and determine... (2 Replies)
Discussion started by: ippy98
2 Replies
7. UNIX for Dummies Questions & Answers
i am trying to make powerterm not echo back this charactor.
≥
When I press control-C I get it that telnet charactor/garbage echos back.
how to turn off? where? what config? is there something in powerterm
to switch on/off? I do not see it.
Redhats offical statement is:
"I... (10 Replies)
Discussion started by: olyanderson
10 Replies
CUT(1) BSD General Commands Manual CUT(1)
NAME
cut -- cut out selected portions of each line of a file
SYNOPSIS
cut -b list [-n] [file ...]
cut -c list [file ...]
cut -f list [-d delim] [-s] [file ...]
DESCRIPTION
The cut utility cuts out selected portions of each line (as specified by list) from each file and writes them to the standard output. If no
file arguments are specified, or a file argument is a single dash ('-'), cut reads from the standard input. The items specified by list can
be in terms of column position or in terms of fields delimited by a special character. Column numbering starts from 1.
The list option argument is a comma or whitespace separated set of numbers and/or number ranges. Number ranges consist of a number, a dash
('-'), and a second number and select the fields or columns from the first number to the second, inclusive. Numbers or number ranges may be
preceded by a dash, which selects all fields or columns from 1 to the last number. Numbers or number ranges may be followed by a dash, which
selects all fields or columns from the last number to the end of the line. Numbers and number ranges may be repeated, overlapping, and in
any order. If a field or column is specified multiple times, it will appear only once in the output. It is not an error to select fields or
columns not present in the input line.
The options are as follows:
-b list
The list specifies byte positions.
-c list
The list specifies character positions.
-d delim
Use delim as the field delimiter character instead of the tab character.
-f list
The list specifies fields, separated in the input by the field delimiter character (see the -d option.) Output fields are separated
by a single occurrence of the field delimiter character.
-n Do not split multi-byte characters. Characters will only be output if at least one byte is selected, and, after a prefix of zero or
more unselected bytes, the rest of the bytes that form the character are selected.
-s Suppress lines with no field delimiter characters. Unless specified, lines with no delimiters are passed through unmodified.
ENVIRONMENT
The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of cut as described in environ(7).
EXIT STATUS
The cut utility exits 0 on success, and >0 if an error occurs.
EXAMPLES
Extract users' login names and shells from the system passwd(5) file as ``name:shell'' pairs:
cut -d : -f 1,7 /etc/passwd
Show the names and login times of the currently logged in users:
who | cut -c 1-16,26-38
SEE ALSO
colrm(1), paste(1)
STANDARDS
The cut utility conforms to IEEE Std 1003.2-1992 (``POSIX.2'').
HISTORY
A cut command appeared in AT&T System III UNIX.
BSD
December 21, 2006 BSD