Zsh substitution, can’t do regex with repetition

regexshellzsh

I'm trying to perform ZSH variable substitution, but I'm having to do it the lame way, by piping through cut. Is it possible to perform this operation entirely within ZSH?

i=./riak.logs.cloudstoragea08/2014-08-07T15:47:49.540310/console.log.2014-07-31-05 echo ${${i/\.\//}:s/\/*//} riak.logs.cloudstoragea08/2014-08-07T15:47:49.540310/console.log.2014-07-31-05 echo ${${i/\.\//}} riak.logs.cloudstoragea08/2014-08-07T15:47:49.540310/console.log.2014-07-31-05 echo ${echo ${i/\.\//} | cut -d/ -f 1} zsh: bad substitution: echo $(echo ${i/\.\//} | cut -d/ -f 1) riak.logs.cloudstoragea08

Best Answer

i=./riak.logs.cloudstoragea08/2014-08-07T15:47:49.540310/console.log.2014-07-31-05
j=${i:2}
echo ${j%%/*}

Alternatively:

expr $i : '\.\/\([^/]*\)/'

Related Solutions

Bash – Unique Features of bash compared to zsh

zsh is for vulcans. ;-)

Seriously: bash 4.0 has some features previously only found in zsh, like ** globbing:

% ls /usr/src/**/Makefile

is equivalent to:

% find /usr/src -name "Makefile"

but obviously more powerful.

In my experience bash's programmable completion performs a bit better than zsh's, at least for some cases (completing debian packages for aptitude for example).

bash has Alt + . to insert !$

zsh has expansion of all variables, so you can use e.g.



% rm !$<Tab>


for this. zsh can also expand a command in backtics, so

% cat `echo blubb | sed 's/u/a/'`<Tab>


yields

% cat blabb


I find it very useful to expand rm *, as you can see what would be removed and can maybe remove one or two files from the commmand to prevent them from being deleted.

Also nice: using the output from commands for other commands that do not read from stdin but expect a filename:

% diff <(sort foo) <(sort bar)


From what I read bash-completion also supports completing remote filenames over ssh if you use ssh-agent, which used to be a good reason to switch to zsh.

Aliases in zsh can be defined to work on the whole line instead of just at the beginning:

% alias -g ...="../.."
% cd ...

How to make zsh completion act more like bash completion

setopt noautomenu
setopt nomenucomplete

You need both of them. If you hit tab enough times, you'll get the list of completions but it will never add any characters to what you've typed so far.

Best Answer

Related Solutions

Bash – Unique Features of bash compared to zsh

How to make zsh completion act more like bash completion

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