Doing some stream editing to change the nasty Parallels icon. It's poorly developed and embedded into the app itself rather than being an image file. So I've located this sed command that has some good feedback:
sudo sed -i.bak s/Parallels_Desktop_Overlay_128/Parallels_Desktop_Overlay_000/g /Applications/Parallels\ Desktop.app/Contents/MacOS/prl_client_app
It returns sed: RE error: illegal byte sequence
Can anyone explain what this means? What part of the command is the problem?
Try setting the LANG environment variable (LANG=C sed ...) or use one of the binary sed tools mentioned here: binary sed replacement
Why the error?
Without LANG=C sed assumes that files are encoded in whatever encoding is specified in LANG and the file (being binary) may contain bytes which are not valid characters in LANG's encoding (thus you could get 'illegal byte sequence').
Why does LANG=C work?
C just happens to treat all ASCII characters as themselves and non-ASCII characters as literals.
bash is your shell, you can enter export LANG=C and try again.
LC_ALL=C sed ... is the more robust approach: if LC_ALL or LC_CTYPE are set (to something other than C), setting LANG will have no effect. (LC_ALL overrides all individually set categories, if any, whereas LANG only takes effect for those categories not explicitly set.)
LANG=C did not work but LC_ALL=C didLANG=C alone didn't do the trick for me but adding LC_CTYPE=C as well solved it.
LC_CTYPE=C is sufficient to solve the problem: LC_CTYPE=C sed .... However, that won't work if LC_ALL is set (to something other than C), because that overrides all individual LC_* categories. Thus, the most robust approach is to use LC_ALL=C sed ....
In addition to LANG=C and LC_CTYPE=C, I had to do LC_ALL=C to get this to work.
LC_ALL overrides all individual LC_* categories. Thus, the most robust approach is to use LC_ALL=C sed ... - no need to also deal with the other variables.
LC_CTYPE value of C is sufficient, so using LC_CTYPE=C sed ... (directly prepending to the offending command) is normally sufficient, unless LC_ALL - which overrides all individual LC_* categories - has been set. Thus, the most robust approach is to use LC_ALL=C sed ... - no need to also deal with the other variables.
LC_ALL=C sed ... approach in comments on all answers on this page, including the currently accepted one. For the complete picture, I suggest consulting my own answer on the duplicate question.I managed to do it by running:
unset LANG
before the sed command.
Not sure what I've done or why it works but it did.
[export] LANG=... (as opposed to setting LC_ALL or setting LC_* categories individually), then unsetting LANG makes all LC_* categories revert to "C"; ending up with a LC_CTYPE value of C is what solves the problem. Conversely, if LC_ALL or even LC_CTYPE specifically are set to something other than C, your approach won't work.