7x31/shellcheck
1
0
Fork 0
mirror of https://github.com/koalaman/shellcheck.git synced 2025-10-03 19:29:44 +08:00
Code Issues Packages Projects Releases Wiki Activity

Add envsubst example

Jordan Cole
2024-01-18 11:10:01 -08:00
parent 046921bfbc
commit 54418029fd
1 changed files with 8 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
SC2016.md

@@ -38,15 +38,23 @@ echo 'PATH=$PATH:/usr/local/bin' >> ~/.bashrc
``` ```
# We also want this variable to expand "$BASH_SOURCE:$LINE..." during an execution trace. # We also want this variable to expand "$BASH_SOURCE:$LINE..." during an execution trace.
# shellcheck disable=SC2016
PS4='+$BASH_SOURCE:$LINENO:$FUNCNAME: ' PS4='+$BASH_SOURCE:$LINENO:$FUNCNAME: '
``` ```
```
# We want to control which environment variables envsubst replaces
# shellcheck disable=SC2016
envsubst '${SERVICE_HOST}:${SERVICE_PORT}' config.template > config
```
ShellCheck also does not warn about escaped expansions in double quotes: ShellCheck also does not warn about escaped expansions in double quotes:
``` ```
echo "PATH=\$PATH:/usr/local/bin" >> ~/.bashrc echo "PATH=\$PATH:/usr/local/bin" >> ~/.bashrc
``` ```
This suggestion is primarily meant to help newbies who assume single and double quotes are basically the same, like in Python and JavaScript. It's not at all meant to discourage experienced users from using single quotes in general. If you are well aware of the difference, please do not hesitate to permanently disable this suggestion with `disable=SC2016` in your `.shellcheckrc`. This suggestion is primarily meant to help newbies who assume single and double quotes are basically the same, like in Python and JavaScript. It's not at all meant to discourage experienced users from using single quotes in general. If you are well aware of the difference, please do not hesitate to permanently disable this suggestion with `disable=SC2016` in your `.shellcheckrc`.
ShellCheck tries to increase the signal-to-noise ratio of this warning by ignoring certain well known commands that frequently expect literal dollar signs, such as `sh` and `perl`. However, there's a long tail of less common commands and flags that also frequently expect `$`s, and it's not in ShellCheck's scope to try to keep track of them all. When you come across such a command, please [[ignore]] the suggestion, either permanently or for that one instance. ShellCheck tries to increase the signal-to-noise ratio of this warning by ignoring certain well known commands that frequently expect literal dollar signs, such as `sh` and `perl`. However, there's a long tail of less common commands and flags that also frequently expect `$`s, and it's not in ShellCheck's scope to try to keep track of them all. When you come across such a command, please [[ignore]] the suggestion, either permanently or for that one instance.