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With GNU utils everything is simpler but well... AIX 6

echo '20170001
20319900
20110232
20000001
20160230
20160229' | while read d; do
date -d$d '+%Y%m%d'; done
date: invalid date...

I learnt sed here (http://www.catonmat.net/blog/sed-one-liners-explained-part-one/) (but I read something before - this (http://www.grymoire.com/Unix/Sed.html) is good.)

Yes it's a good one.
perl -e '
require Net::IP;
$str = "2620:0:2d0:200:0:0:0:7";
$ip = new Net::IP($str, 6);
print $ip->print, "\n";
'
2620:0:2d0:200::7/128

GNU sed with "-E" (or -r - they are the same) option

For solaris this should work

sed 's!^\([^:]*\):[^=]*=\(.*\)!\1 \2!'

Try:
1. Use ordinary quotes instead of double ones.
2. Insert a literal newline after "i" command.

sed -e 'i\
H,0001' -e 's/$/,1,2/' abc > abc.tmp

var=`perl -MList::Util=shuffle -le '@s = shuffle (a..z, 0..9); print @s[0..7]'`

cat FILE | paste - - | sed 's/ Name//'

Try
find FOLDER -maxdepth 1 type -d
instead of
ls -l FOLDER

You don't need '-n' option here.

print substr($testline, 0, 50), "\n"

???
find . -type d

cat FILE
https://ims-svnus.com/dev/DB/trunk/feeds/templates/shell_script.txt -r860
https://ims-svnus.com/dev/DB/trunk/feeds/perl/templates/perl_script.txt -r867...

You can try (in ksh93):
typeset -lE

Try:
ls | egrep 'log_[0-9]+\.xml'

man sudoers

Try:
cp -ar DIR DIR-BAK
cd DIR
for f in *.dat; do
awk 'NF == 1 { $2 = 0 }1' "$f" > ~temp
mv ~temp "$f"
done

Here is my code but it doesn't work. It's because of line ends. Somewhere you have dots, somewhere commas and in one line - 704/11 762,.

perl -F',\s+' -lane ' ...

sed 's/^[A-Z][A-Z]*://'
or GNU sed with ERE (extended regular expressions):
sed -r 's/^[A-Z]+://'

Remove spaces:
'"${datein}"'

(echo aaa.txt
grep xxx aaa.txt | awk '{print $4 }' |
while read n; do #
[ "$n" -ne $((prev+1)) ] && echo #
printf "$n," ...

I like pipes (and cats I like too :) ):
cat INPUTFILE |
while read n; do #
[ "$n" -ne $((prev+1)) ] && echo ...

sed '
1 s/^/DATA_ACQ_CYC_CNTL_ID|DATA_ACQ_CYC_CNTL_SNPSHT_DT|/
2,$ s/^/1783579|090511|/
' INPUTFILE

Oops. I made an awful typo - not NR, but NF. Well, I'm seeing about OFMT.

===

Yes, OFMT is useless (it's just for "print FLOAT"). You can do this:
awk -v min=0.001 -v max=1000.0 '
{
for...

awk -v min=0.001 -v max=1000.0 '{
$1 = $1 # the same formating for all lines
for (i=1; i<=NR; i++)
if ($i)
if ($i < min) $i = min
else if ($i > max)...

find . -mtime +30 -name 'Tkttrans*.tmp' -print | xargs rm