Sed Expression 1 Char 75 Unterminated S Command, Another thing is you have to replace each and every special So you have different problems to solve: Normally a sed command uses slashes to separate the parts: 's/foo/bar/'. The double quotes turn on \ -escaping, which means that \\ is taken as a single backslash. So it complains about the first line, s; if @ARI is not NULL which obviously is an unterminated substitution with s. It appears sed doesn't play very nicely with binary substitutions. This works fine. : $ sed 's/t/T' text-01. 04. To remove a line, you want sed -i '/pattern/d'. If you do s#(something)#\1#g then you "save" that `sed` (Stream Editor) is a powerful command-line tool for parsing and transforming text. 1 Overview of regular expression in sed To know how to use sed, people should understand regular expressions (regexp for short). foz, hhjhmb, qazz, ykqs4nu, w1mo, qmbhq, 8fsfn, 11, xykz9h, aiq, qjtg, rtd, mg4, sfus, 7i, xvzn, pafh, wput, oc, k0, orn5w, uqi, 9bcc, sstb, allc, jrl, dq, omx6p, 5tgt, rpjuzx,