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Bash Display First Friday of the next month


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# 8  
Bash/Gnu Date version
Code:
offsets=(5 4 3 2 1 0 6)
year=2018
for month in {01..12}
do
   date +"%m/%d/%Y" --date "$year/$month/01 + ${offsets[$(date +%w --date ${year}/${month}/01)]} days"
done
01/05/2018
02/02/2018
03/02/2018
04/06/2018
05/04/2018
06/01/2018
07/06/2018
08/03/2018
09/07/2018
10/05/2018
11/02/2018
12/07/2018

Of course, the disadvantage of my solution is that you are running date twice.
Or:
Code:
starts=(6 5 4 3 2 1 7)
year=2018
for month in {01..12}
do
    dstart=$(date +%w --date "$year/$month/01")
    printf "%02d/%02d/%d\n" ${month#0} ${starts[$dstart]} $year
done

Andrew
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NL_LANGINFO(3)						   BSD Library Functions Manual 					    NL_LANGINFO(3)

NAME
nl_langinfo -- get locale information
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <langinfo.h> char * nl_langinfo(nl_item item);
DESCRIPTION
The nl_langinfo() function returns a pointer to a string containing information set by the program's locale. The names and values of item are defined in <langinfo.h>. The entries under Category indicate in which setlocale(3) category each item is defined. Constant Category Meaning CODESET LC_CTYPE Codeset name D_T_FMT LC_TIME String for formatting date and time D_FMT LC_TIME Date format string T_FMT LC_TIME Time format string T_FMT_AMPM LC_TIME A.M. or P.M. time format string AM_STR LC_TIME Ante-meridiem affix PM_STR LC_TIME Post-meridiem affix DAY_1 LC_TIME Name of the first day of the week (e.g.: Sunday) DAY_2 LC_TIME Name of the second day of the week (e.g.: Monday) DAY_3 LC_TIME Name of the third day of the week (e.g.: Tuesday) DAY_4 LC_TIME Name of the fourth day of the week (e.g.: Wednesday) DAY_5 LC_TIME Name of the fifth day of the week (e.g.: Thursday) DAY_6 LC_TIME Name of the sixth day of the week (e.g.: Friday) DAY_7 LC_TIME Name of the seventh day of the week (e.g.: Saturday) ABDAY_1 LC_TIME Abbreviated name of the first day of the week ABDAY_2 LC_TIME Abbreviated name of the second day of the week ABDAY_3 LC_TIME Abbreviated name of the third day of the week ABDAY_4 LC_TIME Abbreviated name of the fourth day of the week ABDAY_5 LC_TIME Abbreviated name of the fifth day of the week ABDAY_6 LC_TIME Abbreviated name of the sixth day of the week ABDAY_7 LC_TIME Abbreviated name of the seventh day of the week MON_1 LC_TIME Name of the first month of the year MON_2 LC_TIME Name of the second month MON_3 LC_TIME Name of the third month MON_4 LC_TIME Name of the fourth month MON_5 LC_TIME Name of the fifth month MON_6 LC_TIME Name of the sixth month MON_7 LC_TIME Name of the seventh month MON_8 LC_TIME Name of the eighth month MON_9 LC_TIME Name of the ninth month MON_10 LC_TIME Name of the tenth month MON_11 LC_TIME Name of the eleventh month MON_12 LC_TIME Name of the twelfth month ABMON_1 LC_TIME Abbreviated name of the first month ABMON_2 LC_TIME Abbreviated name of the second month ABMON_3 LC_TIME Abbreviated name of the third month ABMON_4 LC_TIME Abbreviated name of the fourth month ABMON_5 LC_TIME Abbreviated name of the fifth month ABMON_6 LC_TIME Abbreviated name of the sixth month ABMON_7 LC_TIME Abbreviated name of the seventh month ABMON_8 LC_TIME Abbreviated name of the eighth month ABMON_9 LC_TIME Abbreviated name of the ninth month ABMON_10 LC_TIME Abbreviated name of the tenth month ABMON_11 LC_TIME Abbreviated name of the eleventh month ABMON_12 LC_TIME Abbreviated name of the twelfth month ERA LC_TIME Era description segments ERA_D_FMT LC_TIME Era date format string ERA_D_T_FMT LC_TIME Era date and time format string ERA_T_FMT LC_TIME Era time format string ALT_DIGITS LC_TIME Alternative symbols for digits RADIXCHAR LC_NUMERIC Radix character THOUSEP LC_NUMERIC Separator for thousands YESEXPR LC_MESSAGES Affirmative response expression NOEXPR LC_MESSAGES Negative response expression
RETURN VALUES
nl_langinfo() returns a pointer to an empty string if item is invalid.
EXAMPLES
The following example uses nl_langinfo() to obtain the date and time format for the current locale: #include <time.h> #include <langinfo.h> #include <locale.h> int main(void) { char datestring[100]; struct tm *tm; time_t t; char *ptr; t = time(NULL); tm = localtime(&t); (void)setlocale(LC_ALL, ""); ptr = nl_langinfo(D_T_FMT); strftime(datestring, sizeof(datestring), ptr, tm); printf("%s ", datestring); return (0); }
SEE ALSO
setlocale(3), tm(3), nls(7)
STANDARDS
The nl_langinfo() function conforms to IEEE Std 1003.1-2001 (``POSIX.1'').
HISTORY
The nl_langinfo() function appeared in NetBSD 1.0.
BSD
April 14, 2011 BSD

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