here is my file :srw-rw---- 1 nfsen nfsen 0 mai   16 10:51 nfsen.command I want to remove the s ,I tried comething like chmod 0660 nfsen.commbut  didn't work, any ideas ?
remove s from permission
files;permissions;chmod
You can't remove that s with chmod or anything else because it is not a permission. The first character in each line in ls -l output indicates the type of file: - for regular file, s for socket, d for directory, c(haracter) or b(lock) device, and so on.You can't change the type of a file after it has been created.