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UGU: Unix Guru Universe - Unix Tip #4408- April 6, 2025
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Unix Tip #4408- April 6, 2025
ENHANCED #1576 FILE REVERSAL
This is an enhancement to
UNIX Tip #1576 - April 25, 2001.
The original tip is kind a
cool, so I decided to enhance it.
I hope it's okay with the main author.
#!/bin/ksh
lns=`wc -l $1 | nawk '{ print $1 }`
{
cat $1 | awk '{ line[NR] = $0; }
{ for (i = NR; i > 0; --i) print line[i] }'
} >> $$.temp
tail -"$lns" $$.temp
rm $$.temp
This tip generously supported by: jena_m@hotmail.com
---------------------------------------
FILE REVERSAL
For those that don't have
the tac command, to reverse
a file in UNIX, you could use:
cat | awk '{ line[NR] = $0;} END
{for(i=NR;i>1;i--) print line[i] }'
This tip generously supported by: chandramohan_k@infy.com
NOTE: All tips provided are USE AT YOUR OWN RISK. Tips are submitted
by various unix admins around the globe. UGU suggest you read and
test each tip in a non-volitile environment before placing into
production.
LAST 5 TIPS
4407
- READ IN THE OUTPUT
4406
- FTP AUTOMATED TRANSFERS
4405
- VIEWING ALL C FILES AT ONCE
4404
- ANOTHER RENAMING UPPER TO LOWER
4403
- RESTARTING PROCESSES
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