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Rename all the files within a folder with prefix “Unix_” i.e. suppose a folder has two files a.txt and b.pdf than they both should be renamed from a single command to Unix_a.txt and Unix_b.pdf

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I would call it a prefix, not a suffix. – jlliagre May 14 '11 at 4:53
$ for f in * ; do mv "$f" Unix_"$f" ; done
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The rename command can rename files using regular expressions, which makes it very powerful. In your case, you could do

rename 's/(.*)/Unix_$1/' *.txt
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... and the pdf-File? :) – user unknown May 15 '11 at 3:40
rename 's/(.*)/Unix_$1/' *.pdf – fromnaboo Jul 3 '12 at 1:51
No need to capture, just replace the beggining-of-string: rename 's/^/Unix_/' *.pdf – mmoya Nov 12 '13 at 23:03

If you're using Zsh as your shell, you could also use the function zmv.

Add this line to your .zshrc:

autoload -U zmv

then you could run:

% zmv -W '*' 'Unix_*'

See man zshcontrib for further information.

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The more I read about zsh, the more I like it. – boehj May 15 '11 at 3:34

With the rename utility included in the util-linux package (the one on dj_segfault's answer comes from perl), you could do rename '' Unix_ *

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Some of the other answers might be better however, if I thought that xargs deserved a mention since it is a very powerful tool (and on many systems):

In this particular you could do:

ls | xargs -n1 -I{} mv {} Unix_{}

Edit: Retracted per Gilles' comment. For this situation this solution should be considered only a hack due to the caveats as pointed out by the cited article. The other answers are much better. I still think that xargs is still a useful tool (I use it with svn status relatively frequently), but he's right, for simple execute some command on all files in a tree of directories, this isn't the answer and find is much better. (Leaving the answer since the I think the comment is good for people who'd make the same mistake).

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Don't parse the output of ls. xargs is actually rarely useful, especially now that find … -exec … + exists. – Gilles May 14 '11 at 23:11
Thanks @Gilles that's a good article. Edited retracting my answer. – Charlie May 15 '11 at 1:55

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