$, case, continue, coproc, getopts, select, suspend, ulimit, while: refresh page (#17687)

Refreshed $, case, continue, coproc, getopts, select, suspend, ulimit, while .md pages

Author: Managor

pages/common/$.md

@@ -33,4 +33,4 @@
 
 - Print out a Bash array:
 
-`echo ${array[@]}`
+`echo ${{{array_name[@]}}}`

pages/common/case.md

@@ -13,11 +13,11 @@
 
 - Allow matching multiple patterns:
 
-`case {{$ANIMAL}} in {{cat}}) echo "It's a cat" ;;& {{cat|dog}}) echo "It's a cat or a dog" ;;& *) echo "Fallback" ;; esac`
+`case {{$ANIMAL}} in {{cat}}) {{echo "It's a cat"}} ;;& {{cat|dog}}) {{echo "It's a cat or a dog"}} ;;& *) {{echo "Fallback"}} ;; esac`
 
 - Continue to the next pattern's commands without checking the pattern:
 
-`case {{$ANIMAL}} in {{cat}}) echo "It's a cat" ;& {{dog}}) echo "It's either a dog or cat fell through" ;& *) echo "Fallback" ;; esac`
+`case {{$ANIMAL}} in {{cat}}) echo {{"It's a cat"}} ;& {{dog}}) {{echo "It's either a dog or cat fell through"}} ;& *) {{echo "Fallback"}} ;; esac`
 
 - Display help:
 

pages/common/continue.md

@@ -5,8 +5,8 @@
 
 - Skip to the next iteration:
 
-`while :; do continue; echo "This will never be reached"; done`
+`while :; do continue; {{echo "This will never be reached"}}; done`
 
 - Skip to the next iteration from within a nested loop:
 
-`for i in {1..3}; do while :; do continue 2; done; done`
+`for i in {{{1..3}}}; do {{echo $i}}; while :; do continue 2; done; done`

pages/common/coproc.md

@@ -21,11 +21,11 @@
 
 - Create a coprocess which repeatedly reads `stdin` and runs some commands on the input:
 
-`coproc {{name}} { while read line; do {{command1; command2; ...}}; done }`
+`coproc {{name}} { while read {{line}}; do {{command1; command2; ...}}; done }`
 
 - Create a coprocess which repeatedly reads `stdin`, runs a pipeline on the input, and writes the output to `stdout`:
 
-`coproc {{name}} { while read line; do echo "$line" | {{command1 | command2 | ...}} | cat /dev/fd/0; done }`
+`coproc {{name}} { while read {{line}}; do {{echo "$line"}} | {{command1 | command2 | ...}} | cat /dev/fd/0; done }`
 
 - Create and use a coprocess running `bc`:
 

pages/common/getopts.md

@@ -4,21 +4,25 @@
 > This command does not support longform options and thus using `getopt` is recommended instead.
 > More information: <https://www.gnu.org/software/bash/manual/bash.html#index-getopts>.
 
-- Check if an option is set:
+- Check if an option is the first set option in the current context:
 
-`getopts {{x}} {{opt}}; echo $opt`
+`getopts {{x}} {{opt}}; echo ${{opt}}`
 
-- Set an option to require an argument and check said argument:
+- Check if an option is set in a string (specified option must be the first element of the string):
 
-`getopts {{x}}: {{opt}}; echo $OPTARG`
+`getopts {{x}} {{opt}} "{{string text}}"; echo ${{opt}}`
+
+- Set an option to require an argument and print them:
+
+`getopts {{x}}: {{opt}}; echo ${{opt}} $OPTARG`
 
 - Check for multiple options:
 
-`while getopts {{xyz}} {{opt}}; do case $opt in x) echo x is set;; y) echo y is set;; z) echo z is set;; esac; done`
+`while getopts {{xyz}} {{opt}}; do case ${{opt}} in x) {{echo x is set}};; y) {{echo y is set}};; z) {{echo z is set}};; esac; done`
 
 - Set `getopts` to silent mode and handle option errors:
 
-`while getopts :{{x:}} {{opt}}; do case $opt in x) ;; :) echo "Argument required";; ?) echo "Invalid argument" esac;; done`
+`while getopts :{{x:}} {{opt}}; do case ${{opt}} in x) ;; :) {{echo "Argument required"}};; ?) {{echo "Invalid argument"}} esac;; done`
 
 - Reset `getopts`:
 

pages/common/select.md

@@ -17,4 +17,4 @@
 
 - Create a menu from a Bash array:
 
-`{{fruits}}=({{apple orange pear banana}}); select {{word}} in ${{{fruits[@]}}}; do echo ${{word}}; done`
+`{{fruits}}={{(apple orange pear banana)}}; select {{word}} in ${{{fruits[@]}}}; do echo ${{word}}; done`

pages/common/suspend.md

@@ -9,7 +9,7 @@
 
 - Continue from suspension if `suspend` was used in a non-nested shell (run this in a separate terminal):
 
-`pkill -CONT bash`
+`pkill -CONT {{bash}}`
 
 - Force suspension even if this would lock you out of the system:
 

pages/common/ulimit.md

@@ -18,7 +18,7 @@
 
 - Set max per-user process limit:
 
-`ulimit -u 30`
+`ulimit -u {{30}}`
 
 - Display help (Bash only):
 

pages/common/while.md

@@ -5,7 +5,7 @@
 
 - Read `stdin` and perform an action on every line:
 
-`while read line; do echo "$line"; done`
+`while read line; do {{echo "$line"}}; done`
 
 - Execute a command forever once every second: