Differences

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--- general_commands [2022/09/26 02:24] – [sed] gman
+++ general_commands [2024/06/19 22:27] (current) – gman
@@ Line 1: / Line 1: @@
 ====== CLI: Commands & Usage ======
+===== apt =====
+<code>
+# [1] Update package repo
+apt update
+# [2] Upgrade your distro
+apt full-upgrade -y
+# [3] Remove obsolete packages left after the upgrade
+apt autoremove
+# [4] Clear local repo of useless package files
+apt autoclean
+# Or do it all in one line:
+apt update && apt full-upgrade -y && apt autoremove && apt autoclean
+</code>
+----
 ===== arp =====
 Running ''arp'' at the command line will print the arp table (shows the IPs mapped to MAC addresses).
+----
 ===== check distro =====
@@ Line 20: / Line 43: @@
 pending
+----
+===== dd =====
+==== wipe a disk ====
+Fill the disk with all zeros (may take a while; it switches every bit to 0):
+<code>
+dd if=/dev/zero of=/dev/sdX bs=1M
+# replace X with the target drive letter.
+</code>
+To secure wipe, populate the entire disk with random data rather than zeros (takes longer):
+<code>
+dd if=/dev/urandom of=/dev/sdX bs=1M
+# replace X with the target drive letter.
+</code>
+Sincd ''dd'' does not have a verbose setting, you can get some visual feedback with this (run each in a separate term window):
+<code>
+watch vmstat -d
+htop
+</code>
 ----
@@ Line 146: / Line 199: @@
 ^  Option  ^ Description ^
-|  -a, –all  | Print all remote mounts in the format hostname:directory, where hostname is the name of the client and directory is the root of the filesystem that has been mounted. |
+|  ''-a''            | Print all remote mounts in the format hostname:directory, where hostname is the name of the client and directory is the root of the filesystem that has been mounted. |
-|  -d, –directories  | List directories that have been remotely mounted by clients. |
+|  ''-d''            | List directories that have been remotely mounted by clients. |
-|  -e, –exports  | Print the list of exported filesystems. |
+|  ''-e''            | Print the list of exported filesystems. |
-|  -h, –help  | Provide a short help summary. |
+|  ''-h''            | Provide a short help summary. |
-|  –no-headers  | Do not print headers. |
+|  ''--no-headers''  | Do not print headers. |
-|  -v, –version  | Report the current version of the program. |
+|  ''-v''            | Report the current version of the program. |
 ----
@@ Line 177: / Line 230: @@
 <code>
-tee [OPTIONS] [FILE]
+tee [OPTIONS] [FILE_NAMES]
 #
 # OPTIONS :
@@ Line 188: / Line 241: @@
 <code>[cli program] | tee output_file.txt</code>
+To strip off the color codes, pipe through sed:
+<code>
+[cli program] | sed -r 's/\x1b\[[0-9;]*m//g' | tee output_file.txt
+#  -r   use extended regular expressions
+#   s   s/regexp/replacement/
+# \x1b  The ASCII "escape" character (octal: \033, hex: \x1B or ^[ , or in decimal: 27).
+#       Used to start a series of characters called a control sequence or escape sequence
+</code>
+And you could always alias that in your ''.bashrc'' file:
+<code>
+alias tee="sed -r 's/\x1b\[[0-9;]*m//g' | tee"
+</code>
 ----
+===== tr =====
+**Translate:** Use this to (among other things) convert lower case to upper case. Example:
+<code>
+sha256sum filename.ext | tr [:lower:] [:upper:]
+</code>
+----
 ===== untar =====