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If you want it to work, both echo statements have to be part of one single process, I chose a subprocess:
( test -d /tmp && echo "directory exists" || echo "directory doesn't exists" ) | sed -e...

A small logical rearrangement of Yoda's Solution, and it sort of reads a little more clearly for me (comment line OR no temp):

awk '/^#/||!/temp/' fstab

awk '!(!/^#/&&/temp/)' file

You can change it like this:
# for safety turn off globbing (wild card matching in current directory)
set -f
...
MHOST=$(dig -x "$A" +short) # reverse lookup
if test -n "$MHOST";...

awk -F";" 'NR==FNR{x[$0]++;next;} {if(x[$1]){print $0" HIT";} else print;}' file1 file2

for NUM in 1234 1235
do
nawk -F\; '$7==n' n="${NUM}" myFile
done

When you change FTP settings then you need to refresh FTP services.

svcadm restart ftp

Not a great approach. Try this instead:

awk '{print $1,$3}' /tmp/prod_vfstab |
while read device mntpt; do
mount -F vxfs $device $mntpt
done

I separated LINE into the two variables so you...

try
grep -- "/pb"
or use fgrep.

Something like this?

awk 'NF!=n+1{print "Record",NR,"has",NF-1,"[~] :",$0}' FS="~" n=20 inputfile

Set n to your shell variable (n="var").