Shell Programming and Scripting

  if [[ $FRAG_DUP_LTO5_1 -eq 1 || $FRAG_DUP_LTO5_2 -eq 1 ]];  then
      if [[ $FRAG_LTO3_COPY_1 == "" && $FRAG_LTO3_COPY_2 == "" ]] ; then

+ bpimagelist -backupid ibl_1357326073
+ grep 'FRAG '
+ awk '{print $2,$9}'
+ sort -u
+ awk '{ if (L!=$1) print; L=$1}'
+ egrep -vi '\<C5|\<C6|\<W5|\<W6'
+ awk NR='=1{print $1}'
+ FRAG_LTO3_COPY_1='' 
+ bpimagelist -backupid ibl_1357326073
+ grep 'FRAG '
+ awk '{print $2,$9}'
+ sort -u
+ awk '{ if (L!=$1) print; L=$1}'
+ awk NR='=2{print $1}'
+ egrep -vi '\<C5|\<C6|\<W5|\<W6'
+ FRAG_LTO3_COPY_2=''
+ bpimagelist -backupid ibl_1357326073
+ grep 'FRAG '
+ awk '{print $2,$9}'
+ sort -u
+ awk '{ if (L!=$1) print; L=$1}'
+ egrep -i '\<C5|\<C6\<W5|\<W6'
+ awk NR==1
+ wc -l
+ FRAG_DUP_LTO5_1=0
+ bpimagelist -backupid ibl_1357326073
+ grep 'FRAG '
+ awk '{print $2,$9}'
+ sort -u
+ awk '{ if (L!=$1) print; L=$1}'
+ egrep -i '\<C5|\<C6\<W5|\<W6'
+ wc -l
+ awk NR==1
+ FRAG_DUP_LTO5_2=0
+ echo ''

+ [[ 0 -eq 1 ]]
+ [[ 0 -eq 1 ]]
+ [[ '' -eq 0 ]]

if [ -z $VARIABLE ]

if [[ -z $variable ]] ## Will be true in case variable having no value/values.
 
OR
 
if [[ -n $variable ]] ## Will be true in case variable having value/values.