remove delimiter if condition not satisfied and substitute a string on condition - shell

Question

Consider the below file.
HEAD~XXXX
XXX~XXX~XXX~XXX~XXX~XXX~~WIN~SCRIPT~~~
XXX~XXX~XXX~XXX~XXX~XXX~~WIN~TPSCRI~~~
XXX~XXX~XXX~XXX~XXX~XXX~~WIN~RSCPIT~~~
TAIL~20
wish the Output to be like below for the above:
HEAD~XXXX
XXX~XXX~XXX~XXX~XXX~XXX~~WIN~SCRIPT~~~
XXX~XXX~XXX~XXX~XXX~XXX~~~~~~
XXX~XXX~XXX~XXX~XXX~XXX~~~~~~
TAIL~20
If the 9th field is SCRIPT, I want both 8th & 9th fields to be empty like the 10th & if the line contains words HEAD/TAIL those have to ignored from our above condition, i.e., NF!=13 - will need the header & footer as it is in the input.
I have tried the below, but there should be a smarter way.
awk -F'~' -v OFS='~' '($9 != "Working line takeover with change of CP" {$9 = ""}) && ($9 != "Working line takeover with change of CP" {$8 = ""}) {NF=13; print}' file
the above doesn't work
head -1 file > head
tail -1 file > tail
sed -i '/HDR/d' file
sed -i '/TLR/d' file
sed -i '/^\s*$/d' file
awk -F'~' -v OFS='~' '$9 != "Working line takeover with change of CP" {$9,$8 = ""} {NF=13; print}' file >> file.tmp //syntax error
cat file.tmp >> head
cat tail >> head
echo "" >> head
mv head file1
I'm trying an UNIX shell script with the below requirements.
Consider a file like this..
XXX~XXX~XXX~XXX~XXX~XXX~~XXX~~SCRIPT~~~
XXX~XXX~XXX~XXX~XXX~XXX~~XXX~~OTHERS~~~~
XXX~XXX~XXX~XXX~XXX~XXX~~XXX~~OTHERS~~~
Each file should have 12 fields(~ as delimiter), if not a ~ has to removed.
If anything OTHER than SCRIPT string present in the 10th field, the field has to be removed.
I tried the below in /bin/bash, I know I'm not doing it so well. I'm feeding line to sed & awk commands.
while read readline
echo "entered while"
do
fieldcount=`echo $readline | awk -F '~' '{print NF}'`
echo "Field count printed"
if [ $fieldcount -eq 13 ] && [ $fieldcount -ne 12 ]
then
echo "entering IF & before deletion"
#remove delimiter at the end of line
#echo "$readline~" >> $S_DIR/$1.tmp
#sed -i '/^\s*$/d' $readline
sed -i s'/.$//' $readline
echo "after deletion"
if [ awk '/SCRIPT/' $readline -ne "SCRIPT"]
then
#sed -i 's/SCRIPT//' $readline
replace_what="OTHERS"
#awk -F '~' -v OFS=~ '{$'$replace_what'=''; print }'
sed -i 's/[^,]*//' $replace_what
echo "$readline" >> $S_DIR/$1.tmp
fi
else
echo "$readline" >> $S_DIR/$1.tmp
fi
done < $S_DIR/$1

Answer 1

awk -F'~' -v OFS='~' '$10 != "SCRIPT" {$10 = ""} {NF=12; print}' file
XXX~XXX~XXX~XXX~XXX~XXX~~XXX~~SCRIPT~~
XXX~XXX~XXX~XXX~XXX~XXX~~XXX~~~~
XXX~XXX~XXX~XXX~XXX~XXX~~XXX~~~~
In bash, I would write:
(
# execute in a subshell, so the IFS setting is localized
IFS='~'
while read -ra fields; do
[[ ${fields[9]} != "SCRIPT" ]] && fields[9]=''
echo "${fields[*]:0:12}"
done < file
)
Your followup question:
awk -F'~' -v OFS='~' '
$1 == "HEAD" || $1 == "TAIL" {print; next}
$9 != "SCRIPT" {$8 = $9 = ""}
{NF=13; print}
' file
If you have further questions, please create a new question instead of editing this one.