sed故障排除的无终止`s'命令

Question

I have a problem with sed. I want to replace the entire specific line number for multiple lines in multiples documents.

This the bash command for 1 specific line in 1 specific document:

 BNAME=$(basename $FILE .pdb)
 psfgen1="pdb ./sedpdb/${BNAME}.pdb/"
 sed -i '8s/'.*'/'${psfgen1}'/' ./psfgen.inp

And I get this error : sed: -e expression #1, char 60: unterminated `s' command

Is anyone know how to solve this issue? Thanks!

Answer 1

I can see two things wrong:

1. There are forward slashes in the string that you're attempting to use in the sed command. These will be interpreted as part of the command, so you should use a different delimiter.
2. The * is unquoted, so will be glob-expanded by the shell to the names of all the files in the directory.

Reliably using shell variables in string substitutions is non-trivial but can be done using one of the approaches shown in the answers to this question .

In your case, it looks like you can probably get away with using another character as the delimiter, such as @ :

sed -i "8s@.*@${psfgen1}@" ./psfgen.inp