fix: Add syntax highlighting to code blocks

bash-scripting/changing-the-modification-date-of-a-file.md

@@ -1,5 +1,5 @@
 You can use `touch` to change modification date or time of a file:
-```
+```bash
 touch -d 20210703 filename
 
 # Set the times on a file to a specific date and time:
@@ -7,8 +7,8 @@ touch -t YYYYMMDDHHMM.SS filename
 ```
 
 
-or use the times from a file to set the times on a second file:
+... or use the times from a file to set the times on a second file:
 
-```
+```bash
 touch -r filename filename2
 ```

bash-scripting/getting-the-size-of-a-file.md

@@ -1,5 +1,5 @@
 You can get the size of a file in bytes with:
-```
+```bash
 stat -c %s file_name
 # example
 size=$(stat -c %s $myfile)

bash-scripting/looping-through-the-files.md

@@ -1,12 +1,12 @@
 You can loop through the files with:
-```
+```bash
 for f in * ; do
     echo $f
 done
 ```
 
 If you want to loop through only directories:
-```
+```bash
 for d in */ ; do
     echo $d
 done

bash-scripting/moving-everything-one-level-up.md

@@ -1,5 +1,5 @@
 You can move every file (except the hidden ones) up by one level in the hierarchy with something like this:
-```
+```bash
 for d in */ ; do
     mv $d* .
     rmdir $d # optional

bash-scripting/redirecting-the-output-of-a-command-to-a-file.md

@@ -1,8 +1,8 @@
 1. Redirect stdout to one file and stderr to another file:
-
-    command > out 2>error
-
+```bash
+command > out 2>error
+```
 2. Redirect stdout to a file `out`, and then redirect stderr to stdout:
-
-    command > out 2>&1
-
+```bash
+command > out 2>&1
+```

bash-scripting/splitting-a-string-with-delimiter.md

@@ -1,6 +1,6 @@
 You can split a string with `cut`:
 
-```
+```bash
 foo="hello-world-bye-world"
 bar=$(echo $foo | cut -d"-" -f2)
 echo $bar