95 lines
1.5 KiB
Plaintext
95 lines
1.5 KiB
Plaintext
# INTERNAL VARIABLES
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## Get the location to the `bash` binary
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```shell
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"$BASH"
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```
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## Get the version of the current running `bash` process
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```shell
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# As a string.
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"$BASH_VERSION"
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# As an array.
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"${BASH_VERSINFO[@]}"
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```
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## Open the user's preferred text editor
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```shell
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"$EDITOR" "$file"
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# NOTE: This variable may be empty, set a fallback value.
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"${EDITOR:-vi}" "$file"
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```
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## Get the name of the current function
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```shell
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# Current function.
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"${FUNCNAME[0]}"
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# Parent function.
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"${FUNCNAME[1]}"
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# So on and so forth.
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"${FUNCNAME[2]}"
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"${FUNCNAME[3]}"
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# All functions including parents.
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"${FUNCNAME[@]}"
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```
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## Get the host-name of the system
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```shell
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"$HOSTNAME"
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# NOTE: This variable may be empty.
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# Optionally set a fallback to the hostname command.
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"${HOSTNAME:-$(hostname)}"
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```
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## Get the architecture of the Operating System
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```shell
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"$HOSTTYPE"
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```
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## Get the name of the Operating System / Kernel
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This can be used to add conditional support for different Operating
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Systems without needing to call `uname`.
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```shell
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"$OSTYPE"
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```
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## Get the current working directory
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This is an alternative to the `pwd` built-in.
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```shell
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"$PWD"
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```
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## Get the number of seconds the script has been running
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```shell
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"$SECONDS"
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```
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## Get a pseudorandom integer
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Each time `$RANDOM` is used, a different integer between `0` and `32767` is returned. This variable should not be used for anything related to security (*this includes encryption keys etc*).
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```shell
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"$RANDOM"
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```
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<!-- CHAPTER END -->
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