在没有“嵌套”会话的情况下重新启动 zsh 进程

Question

我想重新启动我的 zsh 会话，因为我保留了一个持久的 tmux 会话并且~/.zshrc经常更改并执行source ~/.zshrc. 但是我意识到随着时间的推移这会变慢（例如for i inseq 50; do source ~/.zshrc; echo "a"; done开始快速打印 'a' 并且很快变慢）。

我在这里阅读了重新启动 zsh 的建议，建议只需运行zsh或zsh -l. 但是，如果我这样做，我会创建一个“嵌套”zsh 会话，如果我理解正确的话。我的意思是：

# Simulate slowed zsh session
for i in `seq 50`; do source ~/.zshrc; echo "a"; done
# use zsh to make it faster "child" zsh
zsh
# confirm fast
source ~/.zshrc; # fast
# revert back to "parent" zsh
exit
# confirm old slow session is still there
source ~/.zshrc; # slow

我有一个带有多个窗口的 tmux 会话和一个我希望保持持久性的命令历史记录。这就是我寻找可持续解决方案的原因。

额外问题：有人知道为什么source ~/.zshrc会放慢速度吗？

# Path to your oh-my-zsh installation.
export ZSH="/Users/username/.oh-my-zsh"

ZSH_THEME="themename"

# Which plugins would you like to load?
# Standard plugins can be found in ~/.oh-my-zsh/plugins/*
# Custom plugins may be added to ~/.oh-my-zsh/custom/plugins/
# Example format: plugins=(rails git textmate ruby lighthouse)
# Add wisely, as too many plugins slow down shell startup.
plugins=(
  git
)

source $ZSH/oh-my-zsh.sh


# activate zsh-syntax-highlighting (brew install zsh-syntax-highlighting)
source /usr/local/share/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh

function proxyON() {
...redacted
}

function proxyOFF(){
 http_proxy=
 https_proxy=
 HTTP_PROXY=
 HTTPS_PROXY=
 export http_proxy https_proxy HTTP_PROXY HTTPS_PROXY
}

function nukeDS_Store(){
 find ~/Projects/mys/ -name '.DS_Store' -delete
}

function reload-ssh() {
   ssh-add -e /Library/OpenSC/lib/opensc-pkcs11.so >> /dev/null
   if [ $? -gt 0 ]; then
       echo "Failed to remove previous card"
   fi
   ssh-add -s /Library/OpenSC/lib/opensc-pkcs11.so 
}

alias fastBuild='mvn install --offline -DskipTests=true'

## History Settings
# set history size
export HISTSIZE=1000000
#save history after logout
export SAVEHIST=1000000
##history file
export HISTFILE=~/.zhistory
##save only one command if 2 common are same and consistent
setopt HIST_IGNORE_DUPS
##add timestamp for each entry
setopt EXTENDED_HISTORY   
##have seperate history for each
setopt nosharehistory
##dont append into history file
setopt NOINC_APPEND_HISTORY


# Set java version
export JAVA_HOME=`/usr/libexec/java_home -v 1.8.0_191`


# Maven
export M3_HOME="/Applications/apache-maven-3.6.0" # replace n.n.n with appropriate version
export M3=$M3_HOME/bin
export PATH=$M3:$PATH

## set node version
export PATH="/usr/local/opt/node@8/bin:$PATH"

## pic-tools
source /Projects/pic-tools/scripts/*.env

Answer 1

只需将您正在运行的 zsh 实例替换为一个新实例：

exec zsh

exec是一个shell 内置命令，目的是（参见zshbuiltins手册页）：

用命令而不是分叉替换当前的 shell。

为什么它变得越来越慢......我的第一个猜测是，你在你的 PATH 中重新定义zshrc了一个目录，可能在一个相当慢的驱动器上。因此，每次zshrc获取 .后，您的搜索路径都会变得越来越长。而且每次都zsh必须重新哈希越来越多的目录......

请阅读我对另一个问题的回答如何改善这种情况。