awk, sed: one liner command for removing spaces from _all_ file names in a given folder? - sed

Question

Before:
eng-vshakya:scripts vshakya$ ls
American Samoa.png Faroe Islands.png Saint Barthelemy.png
After:
eng-vshakya:scripts vshakya$ ls
AmericanSamoa.png FaroeIslands.png SaintBarthelemy.png
Tried below prototype, but it does not work :( Sorry, not very good when it comes to awk/sed :(
ls *.png | sed 's/\ /\\\ /g' | awk '{print("mv "$1" "$1)}'
[ Above is prototype, real command, I guess, would be:
ls *.png | sed 's/\ /\\\ /g' | awk '{print("mv "$1" "$1)}' | sed 's/\ //g'
]

Answer 1

No need to use awk or sed when you can do this in pure bash.
[ghoti#pc ~/tmp1]$ ls -l
total 2
-rw-r--r-- 1 ghoti wheel 0 Aug 1 01:19 American Samoa.png
-rw-r--r-- 1 ghoti wheel 0 Aug 1 01:19 Faroe Islands.png
-rw-r--r-- 1 ghoti wheel 0 Aug 1 01:19 Saint Barthelemy.png
[ghoti#pc ~/tmp1]$ for name in *\ *; do mv -v "$name" "${name// /}"; done
American Samoa.png -> AmericanSamoa.png
Faroe Islands.png -> FaroeIslands.png
Saint Barthelemy.png -> SaintBarthelemy.png
[ghoti#pc ~/tmp1]$
Note that the ${foo/ /} notation is bash, and does not work in classic Bourne shell.

Answer 2

ghoti's solution is the right thing to do. Since you ask how to do it in sed, here's one way:
for file in *; do newfile=$( echo "$file" | tr -d \\n | sed 's/ //g' );
test "$file" != "$newfile" && mv "$file" "$newfile"; done
The tr is there to remove newlines in the filename, and is necessary to ensure that sed sees the entire filename in one line.