Search and replace a specific line with bash - bash

Question

I need add new plugins in my zshrc file using bash script, to do that I search the line which contains plugins = (sometext)
syntax
plugin_text=$(grep "^[^#;]" zshrc | grep -n "plugins=(.*)")
running directly in terminal I get:
$ grep "^[^;]" zshrc | grep -n "plugins=(.*)"
38:# Example format: plugins=(rails git textmate ruby lighthouse)
40:plugins=(git python pip)
40 is the correct line but when I execute my bash script I get:
$ ./config-minimal
3:plugins=(git python pip)
I need change 40 line inserting new plugins. Example:
before
plugins=(git python pip)
after
plugins=(git python pip zsh-autosuggestions zsh-syntax-highlighting)
How can I get this line and replace text with a easy way?
My script
function install_zsh {
# aptitude install zsh
# sh -c "$(wget https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh -O -)"
# Install zsh highlighting
# cd ~/.oh-my-zsh/custom
# git clone https://github.com/zsh-users/zsh-syntax-highlighting.git
# Install zsh auto suggestions
# git clone git://github.com/zsh-users/zsh-autosuggestions
# TODO: Add options in plugins
cd ~
plugin_text=$(grep "^[^#;]" .zshrc | grep -n "plugins=(.*)")
new_plugins=${plugin_text/)/ zsh-autosuggestions zsh-syntax-highlighting)}
line_number=${plugin_text/:plugins*/ }
sed "$(line_number)s/plugin_text/new_plugins/" .zshrc
}

Answer 1

You can handle it with a simple sed:
sed 's/^plugins=(\(.*\)/plugins=(zsh-autosuggestions zsh-syntax-highlighting \1/' .zshrc
Or (thx #123):
sed 's/\(^plugins=([^)]*\)/\1 zsh-autosuggestions zsh-syntax-highlighting/' .zshrc
Add -i flag to infile replacement.
function install_zsh {
# aptitude install zsh
# sh -c "$(wget https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh -O -)"
# Install zsh highlighting
# cd ~/.oh-my-zsh/custom
# git clone https://github.com/zsh-users/zsh-syntax-highlighting.git
# Install zsh auto suggestions
# git clone git://github.com/zsh-users/zsh-autosuggestions
# TODO: Add options in plugins
sed -i.bak 's/^plugins=(\(.*\)/plugins=(zsh-autosuggestions zsh-syntax-highlighting \1/' ~/.zshrc
}