From: "Jun. T" <takimoto-j@kba.biglobe.ne.jp>
To: zsh-users@zsh.org
Cc: Yasuhiro KIMURA <yasu@utahime.org>
Subject: Re: Avoid duplication of code
Date: Mon, 25 May 2020 23:22:39 +0900 [thread overview]
Message-ID: <D7E7657E-0281-4537-825A-2D3021461A67@kba.biglobe.ne.jp> (raw)
In-Reply-To: <20200525.180259.1237420001357827351.yasu@utahime.org>
> 2020/05/25 18:02, Yasuhiro KIMURA <yasu@utahime.org> wrote:
>
> 1. Define function that updates single environment variable and pass
> variable name as argument of it.
> 2. Use 'for name in word; do list done' such as following.
>
> for valname in SSH_AUTH_SOCK SSH_AGENT_PID
> do
> (update value of environment variable named ${valname})
> done
>
> But it seems that both require nested variable expansion and that it
> is impossible. Then is there any other way to avoid code duplication?
Suppose a parameter, say valname, contains a name of another parameter;
valname=SSH_AUTH_SOCK
Then you can GET the current value of SSH_AUTH_SOCK by
if [[ -n ${(P)valname} ]]; then ...
You can SET a new value to SSH_AUTH_SOCK in a couple of ways.
In your case, probably
export $valname='new value'
would be the simplest. If you don't want to export the variable, then,
: ${(P)valname::=new value}
next prev parent reply other threads:[~2020-05-25 14:23 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-25 9:02 Yasuhiro KIMURA
2020-05-25 14:22 ` Jun. T [this message]
2020-05-28 8:05 ` Yasuhiro KIMURA
2020-05-28 8:53 ` Daniel Shahaf
2020-05-28 10:24 ` Yasuhiro KIMURA
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