Merge f3d405a1e3 into 6ba1707fea

Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>
Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: spageektti <git@spageektti.cc>

pages.nl/common/git-add.md

@@ -11,6 +11,10 @@
 
 `git add -A`
 
+- Voeg alle bestanden toe in de huidige map:
+
+`git add .`
+
 - Voeg alleen al bijgehouden bestanden toe:
 
 `git add -u`

pages/common/sort.md

@@ -23,6 +23,10 @@
 
 `sort --field-separator={{:}} --key={{3n}} {{/etc/passwd}}`
 
+- As above, but when items in the 3rd field are equal, sort by the 4th field by numbers with exponents:
+
+`sort -t {{:}} -k {{3,3n}} -k {{4,4g}} {{/etc/passwd}}`
+
 - Sort a file preserving only unique lines:
 
 `sort --unique {{path/to/file}}`
@@ -30,7 +34,3 @@
 - Sort a file, printing the output to the specified output file (can be used to sort a file in-place):
 
 `sort --output={{path/to/file}} {{path/to/file}}`
-
-- Sort numbers with exponents:
-
-`sort --general-numeric-sort {{path/to/file}}`

pages/linux/mopac.md

@@ -0,0 +1,12 @@
+# mopac
+
+> MOPAC (Molecular Orbital PACkage) is a semiempirical quantum chemistry program based on Dewar and Thiel's NDDO approximation.
+> More information: <https://github.com/openmopac/mopac>.
+
+- Perform calculations according to an input file (`.mop`, `.dat`, and `.arc`):
+
+`mopac {{path/to/input_file}}`
+
+- Minimal working example with HF that writes to the current directory and streams the output file:
+
+`touch test.out; echo "PM7\n#comment\n\nH 0.95506 0.05781 -0.03133\nF 1.89426 0.05781 -0.03133" > test.mop; mopac test.mop & tail -f test.out`