Why can certain commands be ran through a variable, while others can't?
114516
How to store pipe ( | ) in a variable?
70132
Is it shell portable to run a command on the same line after variable assignment?
89331
Variable does not exist in the current context?
148295
Shell variable $_ not behaving as expected
149089
Why does `bash ` fail to run?
20731
Can command substitution be nested in variable substitution?
27136
Reference: What is variable scope, which variables are accessible from where and what are "undefined variable" errors?
30206
Where and how is the _ (underscore) variable specified?
25487
How to store a command in a variable in a shell script?
117909
Why doesn't bash expand this variable when I prefix a command with a "one time variable assignment"
85742
Why can't variable names start with numbers?
19713
Why do shell script comparisons often use x$VAR = xyes?
119944
What's the difference between STDIN and arguments passed to command?
102015
Variable assigned to the last executed line?
74517
Is using 'var' to declare variables optional?
135008
Using shell variables for command options
909
What is this shell/Bash syntax: someVariable=someValue someCommand