Data commit

Task/CSV-data-manipulation/UNIX-Shell/csv-data-manipulation-1.sh

@@ -0,0 +1,3 @@
+cat csv | while read S; do
+ [ -z ${S##*C*} ] && echo $S,SUM || echo $S,`echo $S | tr ',' '+' | bc`
+done

Task/CSV-data-manipulation/UNIX-Shell/csv-data-manipulation-2.sh

@@ -0,0 +1,5 @@
+C1,C2,C3,C4,C5,SUM
+1,5,9,13,17,45
+2,6,10,14,18,50
+3,7,11,15,19,55
+4,8,12,16,20,60

Task/CSV-data-manipulation/UNIX-Shell/csv-data-manipulation-3.sh

@@ -0,0 +1,20 @@
+bash>exec 0<"$1"                 # open the input file on stdin
+exec 1>"$1.new"             # open an output file on stdout
+{
+    read -r header
+    echo "$header,SUM"
+    IFS=,
+    while read -r -a numbers; do
+        sum=0
+        for num in "${numbers[@]}"; do
+            (( sum += num ))
+        done
+
+        # can write the above loop as
+        #   sum=$(( $(IFS=+; echo "${numbers[*]}") ))
+
+        echo "${numbers[*]},$sum"
+    done
+} &&
+mv "$1" "$1.bak" &&
+mv "$1.new" "$1"