Bug 1460926
| Summary: | Indexing an Array in Bash is not working as expected | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | Siteshwar Vashisht <svashisht> |
| Component: | bash | Assignee: | Siteshwar Vashisht <svashisht> |
| Status: | CLOSED NOTABUG | QA Contact: | BaseOS QE - Apps <qe-baseos-apps> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 7.4 | CC: | dyordano, pstudeni, qe-baseos-apps |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | 1392951 | Environment: | |
| Last Closed: | 2017-06-19 14:27:33 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1392951 | ||
| Bug Blocks: | |||
Anything between '[' and ']' is evaluated as a math expression. I will explain each command one by one : 'echo ${r[abc]}': Here 'abc' will be replaced with 0, so it returns the 0th element from the array. echo ${r[---abc]}: Here math expression is evaluated as '-(--abc)'. Since 'abc' is 0, it will evaluate to '-(-1)' -> '1'. So it returns 1st element from array. echo ${r[---abc]}: It's the same as previous expression, but 'abc' is set to '-1' due to previous command. It will evaluate to '-(-2)' -> '2'. It returns empty element because array does not have a second element. This is not a bug in bash.