I need to add an header recursively to several file according to the name of the file.
So I have tried:
for i in *file
do
sed -i '1 i \A;B;C;D;E;F;G;H;${i%??}' a_${i} > header_a_${i}
done
the problem is that the variable reflecting the name of the file does not expand and in the header I have ${i%??} instead of part of the name file (%?? is to remove some ending characters).
Any help would be great.
Use double quotes:
sed '1 i\
A;B;C;D;E;F;G;H;'"${i%??}" a_${i} > header_a_${i}
It doesn't make any sense to use -i and to redirect the output, so I've omitted -i. Also, I've added an escaped newline after the insert command. Some sed do not require the newline, but many do. However, it seems odd to use sed for this. Instead, just do:
for i in *file; do
{ echo "A;B;C;D;E;F;G;H;${i%??}"; cat a_${i}; } > header_a_${i}
done
