Question

for example

a=1;b=2;c=3;d=4;e=5

the file is 1.sh

cat 1.sh

echo $a
echo $b
echo $c
echo $d
echo $e

i use the command

source 1.sh

i get

1
2
3
4
5

how can i source the last 3 line of 1.sh?

tail -n 3 1.sh|xargs -0 sh -c

can not work because the variable can not pass to sh

Answer 1

tail -n 3 1.sh > tmp.sh ; source ./tmp.sh ; rm tmp.sh

If necessary, choose or generate a name that’s unlikely to collide with anything else, like /tmp/tmp$$.sh.