Download assets from a list of URLs saved in a file

wget --report-speed=bits -i {path-to-file}

Or, for non-verbose mode, use the -nv flag:

wget -nv --report-speed=bits -i {path-to-file}

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Add execute permissions to a file

chmod u+x {target-file}

Note that the combination of u+x will grant execute permissions to the file owner only, not to Group or everyone. This command is particularly useful when enabling a shell script for execution.

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Create a symlink

ln -s /path/to/file /path/to/symlink

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Empty the contents of a file

In terminal, use this command:

cp /dev/null target-file

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List the contents of a directory by creating a visual representation of the folder tree

tree -L {number} -I {"exclude-path-1|exclude-path-2"} {directory to list}

The -L flag sets the depth of the folder tree; the -I flag excludes one or more directories from listing. By default tree lists the current directory, so if a listing of ./ is needed there's no need to provide a target directory argument.

tree -L 2 -I "dir1 | dir2" ./

source)

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Append text to a file

In terminal, use the cat command with the >> operator:

cat input-file.txt >> append-target.txt

The text will be appended at the end of the target file.

source)

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Prepend text to a file

cat ../../yaml/docset-front-matter.yml | cat - $file > tmp; mv tmp $file

Explanation:

# - Concatenate several files into the target file:
# cat file1 file2 > target_file

Sources

• source
• source

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List all volumes

diskutil list

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Iterate over files

for file in *.txt; do
  mv $file $file.md
done

Sources

• source
• source

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Generate a user-password pair with htpasswd

In a shell, use this command:

htpasswd -c -B .filename username

source