CLI: System & Web #

# Go to home
cd ~

# Go to last directory
cd -

alias ls='exa --all --icons'
alias ll='exa --all --icons --header --long'
alias lt='exa --all --icons --header --long --tree --level=2'

tldr cat
# 
# cat
# 
# Print and concatenate files.
# 
# - Print the contents of a file to the standard output:
#     cat file
# 
# - Concatenate several files into the target file:
#     cat file1 file2 > target_file
# 
# - Append several files into the target file:
#     cat file1 file2 >> target_file
# 
# - Number all output lines:
#     cat -n file
# 
# - Display non-printable and whitespace characters (with `M-` prefix if non-ASCII):
#     cat -v -t -e file

# add text before filename
for f in *; do mv "$f" "something-${f%}"; done

# add text after filename but before extension
for f in *.txt; do mv "$f" "${f%.txt}-something.txt"; done

# change extension
for f in *.txt; do mv "$f" "${f%.txt}.html"; done

tree -a -L 1 <path>
# -a: all files
# -L 1: only first level