Update cheatsheets

tldr/arch

@@ -5,10 +5,8 @@ source: https://github.com/tldr-pages/tldr.git
 ---
 # arch
 
-> Display the name of the system architecture.
-> See also: `uname`.
-> More information: <https://www.gnu.org/software/coreutils/manual/html_node/arch-invocation.html>.
+> This command is an alias of `uname --machine`.
 
-- Display the system's architecture:
+- View documentation for the original command:
 
-`arch`
+`tldr uname`

tldr/hostname

@@ -6,7 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
 # hostname
 
 > Show or set the system's host name.
-> More information: <https://manned.org/hostname>.
+> More information: <https://www.gnu.org/software/inetutils/manual/inetutils.html#hostname-invocation>.
 
 - Show current host name:
 

tldr/id

@@ -28,6 +28,14 @@ source: https://github.com/tldr-pages/tldr.git
 
 `id {{[-g|--group]}}`
 
+- Display all groups the current user belongs to:
+
+`id {{[-Gn|--groups --name]}}`
+
 - Display an arbitrary user's ID (UID), group ID (GID) and groups to which they belong:
 
 `id {{username}}`
+
+- Skip name lookup and specify the UID number explicitly:
+
+`id +{{uid_number}}`

tldr/linux/semanage-fcontext

@@ -15,7 +15,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 - List all user-defined file labelling rules without headings:
 
-`sudo semanage fcontext {{[-l|--list]}} {{[-C|--locallist]}} {{[-n|--noheading]}}`
+`sudo semanage fcontext {{[-lCn|--list --locallist --noheading]}}`
 
 - Add a user-defined rule that labels any path which matches a PCRE `regex`:
 
@@ -27,4 +27,4 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Relabel a directory recursively by applying the new rules:
 
-`restorecon -R -v {{path/to/directory}}`
+`restorecon -Rv {{path/to/directory}}`

tldr/linux/systemctl-mount-image

@@ -13,7 +13,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 `systemctl mount-image {{unit}} /{{path/to/image}} /{{path/to/directory_inside_unit}}`
 
-- Mount the image’s `root` partition with read-only and no-setuid options:
+- Mount the image's `root` partition with read-only and no-setuid options:
 
 `systemctl mount-image {{unit}} /{{path/to/image}} /{{path/to/directory_inside_unit}} root:ro,nosuid`
 

tldr/logname

@@ -6,6 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
 # logname
 
 > Shows the user's login name.
+> See also: `id`.
 > More information: <https://www.gnu.org/software/coreutils/manual/html_node/logname-invocation.html>.
 
 - Display the currently logged in user's name:

tldr/nice

@@ -7,12 +7,25 @@ source: https://github.com/tldr-pages/tldr.git
 
 > Execute a program with a custom scheduling priority (niceness).
 > Niceness values range from -20 (the highest priority) to 19 (the lowest).
+> Note: Some modern schedulers ignore niceness or limit its effects inside autogroups.
 > More information: <https://www.gnu.org/software/coreutils/manual/html_node/nice-invocation.html>.
 
-- Launch a program with altered priority:
+- Print the current niceness value:
+
+`nice`
+
+- Increment the current niceness value by 10:
+
+`nice nice`
+
+- Launch a program with lowered priority:
 
 `nice -{{niceness_value}} {{command}}`
 
+- Launch a program with heightened priority:
+
+`sudo nice --{{niceness_value}} {{command}}`
+
 - Define the priority with an explicit option:
 
 `nice {{[-n|--adjustment]}} {{niceness_value}} {{command}}`

tldr/numfmt

@@ -12,6 +12,18 @@ source: https://github.com/tldr-pages/tldr.git
 
 `numfmt --from si 1.5K`
 
+- Convert 1500 to 1.5K (SI Units):
+
+`numfmt --to si 1500`
+
+- Convert 1.5K (IEC Units) to 1536:
+
+`numfmt --from iec 1.5K`
+
+- Use appropriate conversion based on the suffix:
+
+`numfmt --from auto {{1.5Ki}}`
+
 - Convert 5th field (1-indexed) to IEC Units without converting header:
 
 `ls -l | numfmt --header=1 --field 5 --to iec`

tldr/sc_analysis_dump

@@ -8,6 +8,6 @@ source: https://github.com/tldr-pages/tldr.git
 > Dump of traceroute data in an easily parsed format.
 > More information: <https://www.caida.org/catalog/software/scamper/>.
 
-- Output the traceroute of `warts` files one after the other in an easy-to-parse format:
+- Output the traceroute of `.warts` files one after the other in an easy-to-parse format:
 
 `sc_analysis_dump {{path/to/file1.warts path/to/file2.warts ...}}`

tldr/sc_tracediff

@@ -8,14 +8,14 @@ source: https://github.com/tldr-pages/tldr.git
 > Display traceroute paths where the path has changed.
 > More information: <https://www.caida.org/catalog/software/scamper/>.
 
-- Show the difference between traceroutes in two `warts` files:
+- Show the difference between traceroutes in two `.warts` files:
 
 `sc_tracediff {{path/to/file1.warts}} {{path/to/file2.warts}}`
 
-- Show the difference between the traceroutes in two `warts` files, including those that have not changed:
+- Show the difference between the traceroutes in two `.warts` files, including those that have not changed:
 
 `sc_tracediff -a {{path/to/file1.warts}} {{path/to/file2.warts}}`
 
-- Show the difference between the traceroutes in two `warts` files and try to show DNS names and not IP addresses if possible:
+- Show the difference between the traceroutes in two `.warts` files and try to show DNS names and not IP addresses if possible:
 
 `sc_tracediff -n {{path/to/file1.warts}} {{path/to/file2.warts}}`

tldr/sc_ttlexp

@@ -5,9 +5,9 @@ source: https://github.com/tldr-pages/tldr.git
 ---
 # sc_ttlexp
 
-> Dump source addresses from ICMP TTL expired messages in `warts` files.
+> Dump source addresses from ICMP TTL expired messages in `.warts` files.
 > More information: <https://www.caida.org/catalog/software/scamper/>.
 
-- Output the source address of ICMP TTL expire messages in `warts` files one after the other:
+- Output the source address of ICMP TTL expire messages in `.warts` files one after the other:
 
 `sc_ttlexp {{path/to/file1.warts path/to/file2.warts ...}}`

tldr/sc_warts2csv

@@ -8,6 +8,6 @@ source: https://github.com/tldr-pages/tldr.git
 > Dump traceroutes collected by `scamper` in CSV format.
 > More information: <https://www.caida.org/catalog/software/scamper/>.
 
-- Convert traceroute data in `warts` files to CSV and output it:
+- Convert traceroute data in `.warts` files to CSV and output it:
 
 `sc_warts2csv {{path/to/file1.warts path/to/file2.warts ...}}`

tldr/sc_warts2json

@@ -5,9 +5,9 @@ source: https://github.com/tldr-pages/tldr.git
 ---
 # sc_warts2json
 
-> JSON dump of information contained in a `warts` file.
+> JSON dump of information contained in a `.warts` file.
 > More information: <https://www.caida.org/catalog/software/scamper/>.
 
-- Convert `warts` files to JSON and output the result:
+- Convert `.warts` files to JSON and output the result:
 
 `sc_warts2json {{path/to/file1.warts path/to/file2.warts ...}}`

tldr/sc_warts2pcap

@@ -5,14 +5,14 @@ source: https://github.com/tldr-pages/tldr.git
 ---
 # sc_warts2pcap
 
-> Write packets included in `warts` object to a PCAP file.
-> This is only possible for tbit, sting and sniff.
+> Write packets included in `.warts` files to a PCAP file.
+> This is only possible for packets of type `tbit`, `sting` or `sniff`.
 > More information: <https://www.caida.org/catalog/software/scamper/>.
 
-- Convert the data from several `warts` files into one PCAP file:
+- Convert the data from several `.warts` files into one PCAP file:
 
 `sc_warts2pcap -o {{path/to/output.pcap}} {{path/to/file1.warts path/to/file2.warts ...}}`
 
-- Convert the data from a `warts` file into a PCAP file and sort the packets by timestamp:
+- Convert the data from a `.warts` file into a PCAP file and sort the packets by timestamp:
 
 `sc_warts2pcap -s -o {{path/to/output.pcap}} {{path/to/file.warts}}`

tldr/sc_warts2text

@@ -5,9 +5,9 @@ source: https://github.com/tldr-pages/tldr.git
 ---
 # sc_warts2text
 
-> Simple dump of information contained in a `warts` file.
+> Simple dump of information contained in a `.warts` file.
 > More information: <https://www.caida.org/catalog/software/scamper/>.
 
-- Output the information in `warts` files as text:
+- Output the information in `.warts` files as text:
 
 `sc_warts2text {{path/to/file1.warts path/to/file2.warts ...}}`

tldr/sc_wartscat

@@ -5,9 +5,9 @@ source: https://github.com/tldr-pages/tldr.git
 ---
 # sc_wartscat
 
-> Concatenate `warts` files.
+> Concatenate `.warts` files.
 > More information: <https://www.caida.org/catalog/software/scamper/>.
 
-- Concatenate `warts` files into one:
+- Concatenate `.warts` files into one:
 
 `sc_wartscat -o {{path/to/output.warts}} {{path/to/file1.warts path/to/file2.warts ...}}`

tldr/sc_wartsdump

@@ -5,9 +5,9 @@ source: https://github.com/tldr-pages/tldr.git
 ---
 # sc_wartsdump
 
-> Verbose dump of information contained in a `warts` file.
+> Verbose dump of information contained in a `.warts` file.
 > More information: <https://www.caida.org/catalog/software/scamper/>.
 
-- Output the content of `warts` files verbose:
+- Output the content of `.warts` files verbose:
 
 `sc_wartsdump {{path/to/file1.warts path/to/file2.warts ...}}`

tldr/sc_wartsfilter

@@ -5,7 +5,7 @@ source: https://github.com/tldr-pages/tldr.git
 ---
 # sc_wartsfilter
 
-> Select specific records from a `warts` file.
+> Select specific records from a `.warts` file.
 > More information: <https://www.caida.org/catalog/software/scamper/>.
 
 - Filter all data records that had specific destinations and write them to a separate file:

tldr/sc_wartsfix

@@ -5,7 +5,7 @@ source: https://github.com/tldr-pages/tldr.git
 ---
 # sc_wartsfix
 
-> Truncate damaged `warts` files.
+> Truncate damaged `.warts` files.
 > More information: <https://www.caida.org/catalog/software/scamper/>.
 
 - Save all records (in a separate file) up to the last intact one:

tldr/scamper

@@ -21,14 +21,14 @@ source: https://github.com/tldr-pages/tldr.git
 
 `scamper -c "{{ping}} -P {{UDP-dport}} -d {{33434}}" -i {{192.0.2.1}} -i {{192.0.2.2}}`
 
-- Use the Multipath Discovery Algorithm (MDA) to determine the presence of load-balanced paths to the destination and use ICMP echo packets to sample with a maximum of three attempts, write the result to a `warts` file:
+- Use the Multipath Discovery Algorithm (MDA) to determine the presence of load-balanced paths to the destination and use ICMP echo packets to sample with a maximum of three attempts, write the result to a `.warts` file:
 
 `scamper -O {{warts}} -o {{path/to/output.warts}} -I "{{tracelb}} -P {{ICMP-echo}} -q {{3}} {{192.0.2.1}}"`
 
-- Execute a Paris traceroute with ICMP to a destination and save the result in a compressed `warts` file:
+- Execute a Paris traceroute with ICMP to a destination and save the result in a compressed `.warts` file:
 
 `scamper -O {{warts.gz}} -o {{path/to/output.warts}} -I "{{trace}} -P {{icmp-paris}} {{2001:db8:dead:beaf::4}}"`
 
-- Record all ICMP packets that arrive at a specific IP address and have a specific ICMP ID in a `warts` file:
+- Record all ICMP packets that arrive at a specific IP address and have a specific ICMP ID in a `.warts` file:
 
 `scamper -O {{warts}} -o {{path/to/output.warts}} -I "sniff -S {{2001:db8:dead:beef::6}} icmp[icmpid] == {{101}}"`

tldr/whoami

@@ -5,13 +5,8 @@ source: https://github.com/tldr-pages/tldr.git
 ---
 # whoami
 
-> Print the username associated with the current effective user ID.
-> More information: <https://www.gnu.org/software/coreutils/manual/html_node/whoami-invocation.html>.
+> This command is an alias of `id --user --name`.
 
-- Display currently logged username:
+- View documentation for the original command:
 
-`whoami`
-
-- Display the username after a change in the user ID:
-
-`sudo whoami`
+`tldr id`