#] 
#] *********************
#] "$d_bin"'strings notes.txt'
# www.BillHowell.ca  25Sep2023 initial 
# view in text editor, using constant-width font (eg courier), tabWidth = 3

#48************************************************48




#24************************24
# Table of Contents, generate with :
# $ grep  "^#]"  "$d_bin"'strings notes.txt'  |  sed "s/^#\]/  /" 
#


#24************************24
# Setup, ToDos,   


#08********08
#] ??Feb2024 


#08********08
#] ??Feb2024 


#08********08
#] ??Feb2024 


#08********08
#] ??Feb2024 


#08********08
#] ??Feb2024 


#08********08
#] 05Feb2024 nyet - this is NOT the problem: strings.sh - problematic "purple" coding? 
#]    see "$d_bin"'fileops notes.txt'
	echo  $((  \
				+ $(( $(( enddY - strtY )) * 525960 )) \
				+ $(( $(( enddM - strtM )) *  43830 )) \
				+ $(( $(( enddD - strtD )) *   1440 )) \
				+ $(( $(( enddh - strth )) *     60 )) \
				+ $(( $(( enddm - strtm ))				)) \
			 ))   

calc(){ awk "BEGIN { print "$*" }"; }
comment out calc : 
	tPthP_get_tDeltaDays()  
{
	pinn1="$1"
	pinn2="$2"

	t1=$( pinn_timeModTo_timeUnix  "$pinn1" )
	t2=$( pinn_timeModTo_timeUnix  "$pinn2" )
	tDelta=$(( $t2 - $t1 ))
	#	echo "Unix msecs: t1 = $t1;  t2 = $t2;  tDelta (ms) = $tDelta"  
#	calc  $tDelta/86400
}  

14:24$ date -d "13:00:00" +%s
1707163200
>> OK, that's not the problem

source  "$d_bin"'fileops.sh'
>> is this the problem, try fileops run.sh

strings.sh comment out povr_chrP_rmBetween(povr chrP)
bash  "$d_bin"'strings run.sh' 

the problem is in fileops.sh - very serious if I can't use this!!


#08********08
#] 05Feb2024 Segmentation fault: "linux" script (but not "start" script), strings.sh is problem
check these : 
date_ddmmmyyyy_hms=$(date +"%0e%0b%0Y %0kh%0Mm%0Ss")
date_ddmmmyyyy=$(date +%0e%0b%0Y)
mnthYr=$(date +%0b%0Y)
13:06$ echo "$date_ddmmmyyyy"
05Feb2024
13:06$ mnthYr=$(date +%0b%0Y)
13:06$ echo "$mnthYr"
Feb2024
>> these are all OK

maybe 
# auto-update future dates
sed  "s|<dateCurrent>|$date_ddmmmyyyy|;s|<MmmYyyy>|$mnthYr|"  "$pinn"  

pinn="$d_web"'Forms/0_form notes.txt'
>> works OK!!

check menu in "$d_bin"'0_bin notes.txt' : any obvious typos etc?
>> can't see anything obvious

13:10$ bash  "$d_bin"'date update in form.sh'  "$d_web"'Forms/0_form notes.txt' 
Segmentation fault (core dumped)
>> shit! 

try 
13:13$ cat  "$d_SysMaint"'Linux/find notes.txt'  |  grep "^#\] " 
>> works!!

So try menu with other items
>> 1st column, items 1-8a work fine
>> 2nd column, all OK
>> 3rd column, OK items [27, 30, 33, 92] , Segmentation faults items [55, 66, 77, 88]

That's a BIG hint!
all use "$d_bin"'date update in form.sh'
I changed sources?? : 
	nyet : standard header.sh
	strings.sh, new 01Feb2024 : 
		str_chrP_rmBetween()
		povr_chrP_rmBetween() 

str_chrP_rmBetween() : 
	nChr=${#strInn}
>> this is NOT used in "linux" script??
comment out - replace

I tried : 
	#	echo "chrBeg =  $chrBeg  ,chrEnd = $chrEnd"
	#nChr=${#strInn}		# causes "Segmentation fault" errors in script, OK command line?
	#nChr="${#strInn}"
	nChr=5
		echo "nChr   =  $nChr"
>> still doesn't fix

"$d_bin"'date update in form.sh'  comment out 
#source  "$d_bin""standard header.sh"
#source  "$d_bin"'strings.sh' 
>> works!!

un-uncomment 
source  "$d_bin""standard header.sh"
#source  "$d_bin"'strings.sh' 
>> works!!


#08********08
#] 25Sep2023 search "Linux and how do I revese a string?"

+-----+
https://stackoverflow.com/questions/11461625/reverse-the-order-of-characters-in-a-string
reverse the order of characters in a string
Asked 12 years, 8 months ago
Modified 12 months ago
Viewed 116k times

+--+
Simple:
	var="12345"
	copy=${var}
	
	len=${#copy}
	for((i=$len-1;i>=0;i--)); do rev="$rev${copy:$i:1}"; done
	
	echo "var: $var, rev: $rev"

Output:
	$ bash rev
	var: 12345, rev: 54321

answered Jan 23, 2011 at 6:41
osdyng

+--+
Presume that a variable 'var' has the value '123'
	var="123"
Reverse the string and store in a new variable 'rav':
	rav=$(echo $var | rev)
You'll see the 'rav' has the value of '321' using echo.
	echo $rav

answered Feb 12, 2014 at 22:00
Nick

>> Howell: 
18:22$ echo 'Reverse the string and store in a new variable "rav":'  |  rev
:"var" elbairav wen a ni erots dna gnirts eht esreveR
~

+--+
rev | tail -r (BSD) or rev | tac (GNU) also reverse lines:
	$ rev <<< $'12\n34' | tail -r
	43
	21
	$ rev <<< $'12\n34' | gtac
	43
	21
If LC_CTYPE is C, rev reverses the bytes of multibyte characters:
	$ LC_CTYPE=C rev <<< あの
	��め�
	$ export LC_ALL=C; LC_ALL=en_US.UTF-8 rev <<< あの
	のあ

answered Apr 11, 2013 at 8:56
Lri

+--+
A bash solution improving over @osdyng answer (my edit was not accepted):
	var="12345"     rev=""
	for(( i=0 ; i<${#var} ; i++ )); do rev="${var:i:1}$rev"; done
	echo "var: $var, rev: $rev"

Or an even simpler (bash) loop:
	var=$1   len="${#var}"   i=0   rev=""
	while (( i<len )); do rev="${var:i++:1}$rev"; done
	echo "var: $var, rev: $rev"

A POSIX solution:
	var="12345"     rev=""    i=1
	while  [ "$i" -le "${#var}" ]
	do     rev="$(echo "$var" | awk -v i="$i" '{print(substr($0,i,1))}')$rev"
			: $(( i+=1 ))
	done
	echo "var: $var, rev: $rev"
	Note: This works on multi byte strings. Cut solutions will work only in ASCII (1 byte) strings.

edited Jan 8, 2016 at 3:36
answered Jan 8, 2016 at 1:50
user2350426




# enddoc