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Full Discussion: awk - change variable on fly
Top Forums UNIX for Dummies Questions & Answers awk - change variable on fly Post 302627683 by haczyk on Saturday 21st of April 2012 08:52:45 AM
Old 04-21-2012
my script:
# grep -v ^# letsgo.sh
DateStart="2012/01/01"
DateEnd="2012/04/15"
start=`date +%s -d "$DateStart"`
end=`date +%s -d "$DateEnd"`
gawk -F '^"|","|"$' -v start=$start '{cmd="date +%s -d \"" $10 "\""; cmd | getline current; close(cmd)} current > start ' file.csv > temp.file
# grep -v ^# letsgo.sh

my basic file contains very similiar records like below:

Code:
# cat lol.tmp
"aaaaa","bbbbbb","ccccc","ddddd,eeeee","ffffff","ggggg","3","2012/02/22 12:25:21","2012/02/22 00:00:00","8","hhhh","iiii"
#

I need to count records which have second date (in above example it is "2012/02/22 00:00:00") between given dates (variables $end and $start) and redirect result to temporary file for future modifications.

I saw ready scripts for compare dates (loop in loop), but I thought it will be faster to change dates into unix timestamp and compare. I guess awk is a best tool to such operation, but now I have doubts ;/

If you have better idea - I am willing to listen Smilie

Thanks in advance for any tips.

Kind regards
 

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DP(8)								     [nmh-1.5]								     DP(8)

NAME
dp - parse dates 822-style SYNOPSIS
/usr/lib/mh/dp [-form formatfile] [-format string] [-width columns] [-version] [-help] dates ... DESCRIPTION
Dp is a program that parses dates according to the ARPA Internet standard. It also understands many non-standard formats, such as those produced by TOPS-20 sites and some UNIX sites using ctime(3). It is useful for seeing how nmh will interpret a date. The dp program treats each argument as a single date, and prints the date out in the official 822-format. Hence, it is usually best to enclose each argument in quotes for the shell. To override the output format used by dp, the -format string or -format file switches are used. This permits individual fields of the address to be extracted with ease. The string is simply a format string and the file is simply a format file. See mh-format(5) for the details. Here is the default format string used by dp: %<(nodate{text})error: %{text}%|%(putstr(pretty{text}))%> which says that if an error was detected, print the error, a `:', and the date in error. Otherwise, output the 822-proper format of the date. FILES
$HOME/.mh_profile The user profile PROFILE COMPONENTS
None SEE ALSO
ap(8), Standard for the Format of ARPA Internet Text Messages (RFC-822) DEFAULTS
`-format' default as described above `-width' default to the width of the terminal CONTEXT
None BUGS
The argument to the -format switch must be interpreted as a single token by the shell that invokes dp. Therefore, one must usually place the argument to this switch inside quotes. MH.6.8 11 June 2012 DP(8)
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