command-line-quick-reference
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Missing string manipulation section
refer: https://tldp.org/LDP/abs/html/string-manipulation.html
A word of caution: The ABS is not highly regarded - it is outdated and promotes suboptimal practices. Its maintainer has refused to accept contributions and has refused to collaborate with others.
Reference Greg Wooledge's Wiki and the Bash Hackers Wiki instead :)
thanks