Update cheatsheets

tldr/linux/cu

@@ -10,19 +10,19 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Open a given serial port:
 
-`sudo cu --line {{/dev/ttyXYZ}}`
+`sudo cu {{[-l|--line]}} {{/dev/ttyXYZ}}`
 
 - Open a given serial port with a given baud rate:
 
-`sudo cu --line {{/dev/ttyXYZ}} --speed {{115200}}`
+`sudo cu {{[-l|--line]}} {{/dev/ttyXYZ}} {{[-s|--speed]}} {{115200}}`
 
 - Open a given serial port with a given baud rate and echo characters locally (half-duplex mode):
 
-`sudo cu --line {{/dev/ttyXYZ}} --speed {{115200}} --halfduplex`
+`sudo cu {{[-l|--line]}} {{/dev/ttyXYZ}} {{[-s|--speed]}} {{115200}} {{[-h|--halfduplex]}}`
 
 - Open a given serial port with a given baud rate, parity, and no hardware or software flow control:
 
-`sudo cu --line {{/dev/ttyXYZ}} --speed {{115200}} --parity={{even|odd|none}} --nortscts --nostop`
+`sudo cu {{[-l|--line]}} {{/dev/ttyXYZ}} {{[-s|--speed]}} {{115200}} --parity={{even|odd|none}} {{[-f|--nortscts]}} --nostop`
 
 - Exit the `cu` session when in connection:
 

tldr/linux/dmesg

@@ -14,15 +14,15 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Show kernel error messages:
 
-`sudo dmesg --level err`
+`sudo dmesg {{[-l|--level]}} err`
 
 - Show kernel messages and keep reading new ones, similar to `tail -f` (available in kernels 3.5.0 and newer):
 
-`sudo dmesg -w`
+`sudo dmesg {{[-w|--follow]}}`
 
 - Show how much physical memory is available on this system:
 
-`sudo dmesg | grep -i memory`
+`sudo dmesg | grep {{[-i|--ignore-case]}} memory`
 
 - Show kernel messages 1 page at a time:
 
@@ -30,12 +30,12 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Show kernel messages with a timestamp (available in kernels 3.5.0 and newer):
 
-`sudo dmesg -T`
+`sudo dmesg {{[-T|--ctime]}}`
 
 - Show kernel messages in human-readable form (available in kernels 3.5.0 and newer):
 
-`sudo dmesg -H`
+`sudo dmesg {{[-H|--human]}}`
 
 - Colorize output (available in kernels 3.5.0 and newer):
 
-`sudo dmesg -L`
+`sudo dmesg {{[-L|--color]}}`

tldr/linux/halt

@@ -14,7 +14,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Power off the system (same as `poweroff`):
 
-`halt --poweroff`
+`halt {{[-p|--poweroff]}}`
 
 - Reboot the system (same as `reboot`):
 
@@ -22,8 +22,8 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Halt immediately without contacting the system manager:
 
-`halt --force`
+`halt {{[-f|--force]}}`
 
 - Write the wtmp shutdown entry without halting the system:
 
-`halt --wtmp-only`
+`halt {{[-w|--wtmp-only]}}`

tldr/linux/iostat

@@ -18,7 +18,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Display CPU statistics:
 
-`iostat -c`
+`iostat {{[-c|--compact]}}`
 
 - Display disk statistics with disk names (including LVM):
 

tldr/linux/iptables

@@ -11,24 +11,24 @@ source: https://github.com/tldr-pages/tldr.git
 
 - View chains, rules, packet/byte counters and line numbers for the filter table:
 
-`sudo iptables --verbose --numeric --list --line-numbers`
+`sudo iptables {{[-vnL --line-numbers|--verbose --numeric --list --line-numbers]}}`
 
-- Set chain [P]olicy rule:
+- Set chain policy rule:
 
-`sudo iptables --policy {{chain}} {{rule}}`
+`sudo iptables {{[-P|--policy]}} {{chain}} {{rule}}`
 
-- [A]ppend rule to chain policy for IP:
+- Append rule to chain policy for IP:
 
-`sudo iptables --append {{chain}} --source {{ip}} --jump {{rule}}`
+`sudo iptables {{[-A|--append]}} {{chain}} {{[-s|--source]}} {{ip}} {{[-j|--jump]}} {{rule}}`
 
-- [A]ppend rule to chain policy for IP considering [p]rotocol and port:
+- Append rule to chain policy for IP considering protocol and port:
 
-`sudo iptables --append {{chain}} --source {{ip}} --protocol {{tcp|udp|icmp|...}} --dport {{port}} --jump {{rule}}`
+`sudo iptables {{[-A|--append]}} {{chain}} {{[-s|--source]}} {{ip}} {{[-p|--protocol]}} {{tcp|udp|icmp|...}} --dport {{port}} {{[-j|--jump]}} {{rule}}`
 
 - Add a NAT rule to translate all traffic from the `192.168.0.0/24` subnet to the host's public IP:
 
-`sudo iptables --table {{nat}} --append {{POSTROUTING}} --source {{192.168.0.0/24}} --jump {{MASQUERADE}}`
+`sudo iptables {{[-t|--table]}} {{nat}} {{[-A|--append]}} {{POSTROUTING}} {{[-s|--source]}} {{192.168.0.0/24}} {{[-j|--jump]}} {{MASQUERADE}}`
 
-- [D]elete chain rule:
+- Delete chain rule:
 
-`sudo iptables --delete {{chain}} {{rule_line_number}}`
+`sudo iptables {{[-D|--delete]}} {{chain}} {{rule_line_number}}`

tldr/linux/minicom

@@ -10,15 +10,15 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Open a given serial port:
 
-`sudo minicom --device {{/dev/ttyXYZ}}`
+`sudo minicom {{[-D|--device]}} {{/dev/ttyXYZ}}`
 
 - Open a given serial port with a given baud rate:
 
-`sudo minicom --device {{/dev/ttyXYZ}} --baudrate {{115200}}`
+`sudo minicom {{[-D|--device]}} {{/dev/ttyXYZ}} {{[-b|--baudrate]}} {{115200}}`
 
 - Enter the configuration menu before communicating with a given serial port:
 
-`sudo minicom --device {{/dev/ttyXYZ}} --setup`
+`sudo minicom {{[-D|--device]}} {{/dev/ttyXYZ}} {{[-s|--setup]}}`
 
 - Exit minicom:
 

tldr/linux/reboot

@@ -14,7 +14,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Power off the system (same as `poweroff`):
 
-`reboot --poweroff`
+`reboot {{[-p|--poweroff]}}`
 
 - Halt (terminates all processes and shuts down the CPU) the system (same as `halt`):
 
@@ -22,8 +22,8 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Reboot immediately without contacting the system manager:
 
-`reboot --force`
+`reboot {{[-f|--force]}}`
 
 - Write the wtmp shutdown entry without rebooting the system:
 
-`reboot --wtmp-only`
+`reboot {{[-w|--wtmp-only]}}`

tldr/linux/rmdir

@@ -15,4 +15,4 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Remove specific nested directories recursively:
 
-`rmdir --parents {{path/to/directory1 path/to/directory2 ...}}`
+`rmdir {{[-p|--parents]}} {{path/to/directory1 path/to/directory2 ...}}`

tldr/linux/shutdown

@@ -14,11 +14,11 @@ source: https://github.com/tldr-pages/tldr.git
 
 - [r]eboot immediately:
 
-`shutdown -r now`
+`shutdown {{[-r|--reboot]}} now`
 
 - [r]eboot in 5 minutes:
 
-`shutdown -r +{{5}} &`
+`shutdown {{[-r|--reboot]}} +{{5}} &`
 
 - Shutdown at 1:00 pm (Uses 24[h] clock):
 

tldr/linux/strace

@@ -10,19 +10,19 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Start tracing a specific [p]rocess by its PID:
 
-`strace -p {{pid}}`
+`strace {{[-p|--attach]}} {{pid}}`
 
-- Trace a [p]rocess and filt[e]r output by system call:
+- Trace a [p]rocess and filter output by system call [e]xpression:
 
-`strace -p {{pid}} -e {{system_call,system_call2,...}}`
+`strace {{[-p|--attach]}} {{pid}} -e {{system_call,system_call2,...}}`
 
 - Count time, calls, and errors for each system call and report a summary on program exit:
 
-`strace -p {{pid}} -c`
+`strace {{[-p|--attach]}} {{pid}} {{[-c|--summary-only]}}`
 
-- Show the [T]ime spent in every system call and specify the maximum string [s]ize to print:
+- Show the time spent in every system call and specify the maximum string size to print:
 
-`strace -p {{pid}} -T -s {{32}}`
+`strace {{[-p|--attach]}} {{pid}} {{[-T|--syscall-times]}} {{[-s|--string-limit]}} {{32}}`
 
 - Start tracing a program by executing it:
 
@@ -32,6 +32,6 @@ source: https://github.com/tldr-pages/tldr.git
 
 `strace -e trace=file {{program}}`
 
-- Start tracing network operations of a program as well as all its [f]orked and child processes, saving the [o]utput to a file:
+- Start tracing network operations of a program as well as all its forked and child processes, saving the output to a file:
 
-`strace -f -e trace=network -o {{trace.txt}} {{program}}`
+`strace {{[-f|--follow-forks]}} -e trace=network {{[-o|--output]}} {{trace.txt}} {{program}}`

tldr/linux/systemctl

@@ -34,7 +34,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 - List all service/socket/automount units filtering by running/failed state:
 
-`systemctl list-units --type={{service|socket|automount}} --state={{failed|running}}`
+`systemctl list-units {{[-t|--type]}} {{service|socket|automount}} --state {{failed|running}}`
 
 - Show the contents & absolute path of a unit file: