parens in sed
in [Shell]
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From: Lao Ming on 30 Oct 2009 17:05 I'm trying format the output of md5 so it does not contain unneeded punctuation. In particular, I want to remove "^MD5", the two parens and the equal sign in e.g. MD5 (./.bashrc) = 92caf5b1a55b3daf31d7616e81c94742 This should be easy but I'm encountering something strange and apparently can't see it. My command is: sed "s/^MD5 \(//" |sed "s/\) =//" "$file" sed: 1: "s/^MD5 \(//": RE error: parentheses not balanced sed: 1: "s/\) =//": RE error: parentheses not balanced Thanks for any help. My software versions are below. bash --version; sw_vers GNU bash, version 2.05b.0(1)-release (powerpc-apple-darwin8.0) Copyright (C) 2002 Free Software Foundation, Inc. ProductName: Mac OS X ProductVersion: 10.4.10 BuildVersion: 8R218
From: Ed Morton on 30 Oct 2009 17:28 On Oct 30, 4:05 pm, Lao Ming <laoming...(a)gmail.com> wrote: > I'm trying format the output of md5 so it does not contain unneeded > punctuation. > In particular, I want to remove "^MD5", the two parens and the equal > sign in e.g. > > MD5 (./.bashrc) = 92caf5b1a55b3daf31d7616e81c94742 > > This should be easy but I'm encountering something strange and > apparently can't see it. > My command is: > > sed "s/^MD5 \(//" |sed "s/\) =//" "$file" > > sed: 1: "s/^MD5 \(//": RE error: parentheses not balanced > sed: 1: "s/\) =//": RE error: parentheses not balanced > > Thanks for any help. My software versions are below. > > bash --version; sw_vers > GNU bash, version 2.05b.0(1)-release (powerpc-apple-darwin8.0) > Copyright (C) 2002 Free Software Foundation, Inc. > ProductName: Mac OS X > ProductVersion: 10.4.10 > BuildVersion: 8R218 $ echo "MD5 (./.bashrc) = 92caf5b1a55b3daf31d7616e81c94742" | sed 's/^MD5 ([^)][^)]*) =//' 92caf5b1a55b3daf31d7616e81c94742 Ed.
From: Seebs on 30 Oct 2009 17:27 On 2009-10-30, Lao Ming <laomingliu(a)gmail.com> wrote: > I'm trying format the output of md5 so it does not contain unneeded > punctuation. > In particular, I want to remove "^MD5", the two parens and the equal > sign in e.g. > > MD5 (./.bashrc) = 92caf5b1a55b3daf31d7616e81c94742 To just get the last value: awk '{print $NR}' ${line##*= } sed -e 's/.*= //' Getting the name is a bit trickier. I'd probably do sed -e 's!MD5 (\(.*\)) = \(.*\)!\1 \2!g' > This should be easy but I'm encountering something strange and > apparently can't see it. Yes. > sed "s/^MD5 \(//" |sed "s/\) =//" "$file" > > sed: 1: "s/^MD5 \(//": RE error: parentheses not balanced > sed: 1: "s/\) =//": RE error: parentheses not balanced In sed, ( matches a (, but \( introduces a subexpression (see the example above). Note that there are multiple md5-type utilities, which have slightly different output format. It looks like you're using a BSD-flavored "md5" utility. You might be happier with "md5 -r": $ md5 -r /tmp/t 27a67d2ee992c3bd20cdef673b6cf0ac /tmp/t -s -- Copyright 2009, all wrongs reversed. Peter Seebach / usenet-nospam(a)seebs.net http://www.seebs.net/log/ <-- lawsuits, religion, and funny pictures http://en.wikipedia.org/wiki/Fair_Game_(Scientology) <-- get educated!
From: pk on 30 Oct 2009 17:25 Lao Ming wrote: > I'm trying format the output of md5 so it does not contain unneeded > punctuation. > In particular, I want to remove "^MD5", the two parens and the equal > sign in e.g. > > MD5 (./.bashrc) = 92caf5b1a55b3daf31d7616e81c94742 in this specific case, sed 's/.* //' should do. To keep with what you were trying to do, parentheses in sed are literal unless escaped, so you probably wanted this: sed 's/^MD5 ([^(]*) = //' however that will fail if the string between (....) contains itself a (.
From: Steven J Masta on 30 Oct 2009 22:18
Lao Ming wrote: > I'm trying format the output of md5 so it does not contain unneeded > punctuation. > In particular, I want to remove "^MD5", the two parens and the equal > sign in e.g. > > MD5 (./.bashrc) = 92caf5b1a55b3daf31d7616e81c94742 > > This should be easy but I'm encountering something strange and > apparently can't see it. > My command is: > > sed "s/^MD5 \(//" |sed "s/\) =//" "$file" > > sed: 1: "s/^MD5 \(//": RE error: parentheses not balanced > sed: 1: "s/\) =//": RE error: parentheses not balanced > > Thanks for any help. My software versions are below. > > > > bash --version; sw_vers > GNU bash, version 2.05b.0(1)-release (powerpc-apple-darwin8.0) > Copyright (C) 2002 Free Software Foundation, Inc. > ProductName: Mac OS X > ProductVersion: 10.4.10 > BuildVersion: 8R218 > Using GNU sed 4.1.5 this works for me: % cat test.md5 MD5 (./.bashrc) = 92caf5b1a55b3daf31d7616e81c94742 % sed 's/^MD5 (\(.*\)) =/\1/' test.md5 ../.bashrc 92caf5b1a55b3daf31d7616e81c94742 Steve |