57 lines
2.0 KiB
Markdown
57 lines
2.0 KiB
Markdown
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# Bash
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Bash is a classic and should always be understood. After all, it was the first shell that you used so there's a bit of nostalgia surrounding it.
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- `touch` creates the file named `zk_sync` and `chmod +x` makes the file an executable file, but we still need to say what shell will execute this file, and what exactly are the commands to be executed.
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- [ bash command](https://discussions.apple.com/thread/252176464) for Big Sur if you ever decide to upgrade
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- the oh-my-zsh version of bash is now regularly maintained through a git repo called [Bash-It](https://github.com/Bash-it/bash-it)
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- check the file size of something in your directory by ```wc -c /Users/shwethajayaraj/qisket/file```
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- you can further turn it into a bash variable by doing:
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- ```myfilesize=$(wc -c "/etc/passwd" | awk '{print $1}')
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printf "%d\n" $myfilesize
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echo "$myfilesize"```
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### Shell Scripting Tips:
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- Safe shell scripting practices --> Make sure to use " " !
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- example : `cat /Applications/Android Studio.app/Contents` will give you an error
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- but `cat "/Applications/Android Studio.app/Contents"` will work!
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- Export paths as an Env variable
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- example: `export AS_HOME="/Applications/Android Studio.app/Contents"`
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- Dealing with Path with Spaces in it:
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- use either back slashes or quotation marks not both
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- example:
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```shell
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export PATH=/Applications/Sublime\ Text\ 2.app/Contents/SharedSupport/bin/subl:$PATH
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```
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or
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```shell
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export PATH="/Applications/Sublime Text 2.app/Contents/SharedSupport/bin/subl:$PATH"
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```
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Not both.
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Try out the script and see if `the file or directory not found` error comes up.
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---
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### More Tips:
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- a useful [bash history terminal command tweak ](https://danten.io/bash-history-searching-with-inputrc/)
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You can just use `exec` to replace your current shell with a new shell:
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Switch to `bash`:
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```
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exec bash
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```
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Switch to `zsh`:
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```
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exec zsh
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```
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This won't affect new terminal windows or anything, but it's convenient.
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