CODEWITHSUNDEEP
ubuntushzsh
Yad Smood
Yad Smood

Reputation: 2942

What this line means in oh-my-zsh?

In the oh-my-zsh's upgrade tool, I found this line(line 2):

current_path=${current_path/ /\\ }

What it did?

Additionally, this line works on mac, but on my ubuntu server it output a error says:

.oh-my-zsh/tools/upgrade.sh: 2: .oh-my-zsh/tools/upgrade.sh: Bad substitution

Upvotes: 2

Views: 2325

Answers (4)

wormhit
wormhit

Reputation: 3837

I managed to update using commands:

cd ~/.oh-my-zsh
ggpull

#or

git pull origin master

Upvotes: 1

DmitrySandalov
DmitrySandalov

Reputation: 4109

Updated it on Ubuntu with

cd ~/.oh-my-zsh
bash ~/.oh-my-zsh/tools/upgrade.sh

Upvotes: 11

Adrian Frühwirth
Adrian Frühwirth

Reputation: 45686

See parameter expansion in the manual.

${name/pattern/repl}
${name//pattern/repl} 

Replace the longest possible match of pattern in the expansion of parameter name by string repl. The first form replaces just the first occurrence, the second form all occurrences.

In essence, what the above does is prepend a backslash to the first space in ${current_path}.

Note that this syntax is not specified by POSIX (see here for more info), but all current bash, ksh and zsh versions support it. The Bad substitution error suggests that you are not running the upgrade.sh tool under the shell that you think you do (one which does not support it).

Upvotes: 2

qqx
qqx

Reputation: 19495

That line will backslash escape the first space in the $current_path variable. That type of substitution isn't supported by all shells, which is why it fails on Ubuntu.

As far as I can tell, there is no good reason for that line to be there. If escaping white space where necessary, that method would be insufficient even if it worked. Worse, since the only later use of the variable has it in double quotes having backslash escapes for spaces actually breaks it.

Upvotes: 1

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