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Top Forums Shell Programming and Scripting Printing array elements in reverse Post 302980033 by RavinderSingh13 on Tuesday 23rd of August 2016 03:51:38 AM
Old 08-23-2016
Hello H squared,

Please use code tags as per forum rules for commands/Inputs/codes you are using into your posts. If you have an Input_file and you want to print all the lines into reverse order then following may help you in same.
Code:
awk '{num=split($0, A," ");for(i=num;i>=1;i--){Q=Q?Q OFS $i:$i};print Q;Q=""}'   Input_file

EDIT: We could following solutions too.
Code:
perl -ne 'chomp;print scalar reverse . "\n";'  Input_file

You could use rev if you have it in your box as follows.
Code:
echo "1 2 3 4" | rev
OR
rev Input_file

EDIT2: If you want to print reverse array's elements reverse format into shell and into one line then following may help you in same too.
Code:
#!/bin/bash
arr=( 1 2 3 4 )
n=${#arr[*]}
for (( i = n-1; i >= 0; i-- )); do     Q="$Q ${arr[i]}"; done
echo $Q
  
OR
  
#!/bin/bash
arr=( 1 2 3 4 )
n=${#arr[*]}
for (( i = n-1; i >= 0; i-- ))
do
     Q="$Q ${arr[i]}"
done
echo $Q

Thanks,
R. Singh

Last edited by RavinderSingh13; 08-24-2016 at 04:33 AM.. Reason: Added 2 more solutions too now. Added solution for shell's array too now.
This User Gave Thanks to RavinderSingh13 For This Post:
 

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DATEFMT_LOCALTIME(3)							 1						      DATEFMT_LOCALTIME(3)

IntlDateFormatter::localtime - Parse string to a field-based time value

	Object oriented style

SYNOPSIS
public array IntlDateFormatter::localtime (string $value, [int &$position]) DESCRIPTION
Procedural style array datefmt_localtime (IntlDateFormatter $fmt, string $value, [int &$position]) Converts string $value to a field-based time value ( an array of various fields), starting at $parse_pos and consuming as much of the input value as possible. PARAMETERS
o $fmt - The formatter resource o $value - string to convert to a time o $position - Position at which to start the parsing in $value (zero-based). If no error occurs before $value is consumed, $parse_pos will contain -1 otherwise it will contain the position at which parsing ended . If $parse_pos > strlen($value), the parse fails immedi- ately. RETURN VALUES
Localtime compatible array of integers : contains 24 hour clock value in tm_hour field EXAMPLES
Example #1 datefmt_localtime(3) example <?php $fmt = datefmt_create( 'en_US', IntlDateFormatter::FULL, IntlDateFormatter::FULL, 'America/Los_Angeles', IntlDateFormatter::GREGORIAN ); $arr = datefmt_localtime($fmt, 'Wednesday, December 31, 1969 4:00:00 PM PT', 0); echo 'First parsed output is '; if ($arr) { foreach ($arr as $key => $value) { echo "$key : $value , "; } } ?> Example #2 OO example <?php $fmt = new IntlDateFormatter( 'en_US', IntlDateFormatter::FULL, IntlDateFormatter::FULL, 'America/Los_Angeles', IntlDateFormatter::GREGORIAN ); $arr = $fmt->localtime('Wednesday, December 31, 1969 4:00:00 PM PT', 0); echo 'First parsed output is '; if ($arr) { foreach ($arr as $key => $value) { echo "$key : $value , "; } } ?> The above example will output: First parsed output is tm_sec : 0 , tm_min : 0 , tm_hour : 16 , tm_year : 1969 , tm_mday : 31 , tm_wday : 4 , tm_yday : 365 , tm_mon : 11 , tm_isdst : 0 , SEE ALSO
datefmt_create(3), datefmt_format(3), datefmt_parse(3), datefmt_get_error_code(3), datefmt_get_error_message(3). PHP Documentation Group DATEFMT_LOCALTIME(3)
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