Shell Programming and Scripting

A="a b c d e f g 1 2 3 4 5"
B="c 3"

C="a b d e f g 1 2 4 5"

cat file1
a
b
c
d
e
f
g
1
2
3
4
5

cat file2
c
3

a
b
d
e
f
g
1
2
4
5

for i in `echo "$A"`
do
flag=0
for j in `echo "$B"`
do
[[ "$j" == "$i" ]]  && flag=1
done
[[ $flag -eq 0 ]] && echo -n "$i "
done
echo ""

grep -v -f file2 file1

#!bin/bash

A="a b c d e f g 1 2 3 4 5"
B="c 3"
C=$A

for i in $B; do

    if [ $(echo $A | grep "$i"| wc -l) -eq 1 ];then
        C=$(echo $C | sed 's/'$i'//g'| tr -s ' ' ' ')
    fi

done

printf "A = $A\nB = $B\nC = $C\n"

#!bin/bash

A="a b c d e f g 1 2 3 4 5"
B="c 3"
C=$(echo $A | sed 's/'$(echo $B | sed 's/[[:space:]]/\\\|/g')'//g' | tr -s ' ' ' ')

printf "A = $A\nB = $B\nC = $C\n"

A = a b c d e f g 1 2 3 4 5
B = c 3
C = a b d e f g 1 2 4 5

$ awk 'FNR==NR{A[$1]++;next}!A[$1]' file2 file1

$ comm -23 <(sort file1) <(sort file2) | sort -n

$ join -v 1  <(sort file1) <(sort file2) | sort -n

$ diff -y  --suppress-common-lines  file1 file2 | cut -f1

$ sdiff --suppress-common-lines  file1 file2 | cut -f1

a
b
d
e
f
g
1
2
4
5

 sed -r "s/ +(${B// /|}) +/ /g" <<< $A

A="a b c d e f g 1 2 3 4 5"
B="c 3"

C=
for i in $A; do
  for j in $B; do
    if [ "$i" = "$j" ]; then
      continue 2
    fi
  done
  C="$C$i "
done
printf "%s\n" "${C% }"