====== Bash Scripts ======

===== Getting current date =====
<code current_date.sh>
#!/bin/bash
DATE=$(date +"%Y-%m-%d")
echo $DATE
</code>

===== Extracting compressed files =====
Taken from a [[https://www.reddit.com/r/commandline/comments/p5ibiz/i_keep_forgetting_how_to_extract_tar_or_7z/|reddit post]] on [[https://www.reddit.com/r/commandline/|r/commandline]]:
<code bash extract.sh>
#!/bin/sh

export XZ_OPT=-T4

if [ -z "$1" ]; then
    echo "Usage: extract filename"
    echo "Extract a given file based on the extension."
    exit 1
elif [ ! -f "$1" ]; then
    echo "Error: '$1' is not a valid file for extraction"
    exit 1
fi

case "$1" in
    *.tbz2 | *.tar.bz2) tar -xvjf  "$1"     ;;
    *.txz | *.tar.xz)   tar -xvJf  "$1"     ;;
    *.tgz | *.tar.gz)   tar -xvzf  "$1"     ;;
    *.tar | *.cbt)      tar -xvf   "$1"     ;;
    *.tar.zst)          tar -xvf   "$1"     ;;
    *.zip | *.cbz)      unzip      "$1"     ;;
    *.rar | *.cbr)      unrar x    "$1"     ;;
    *.arj)              unarj x    "$1"     ;;
    *.ace)              unace x    "$1"     ;;
    *.bz2)              bunzip2    "$1"     ;;
    *.xz)               unxz       "$1"     ;;
    *.gz)               gunzip     "$1"     ;;
    *.7z)               7z x       "$1"     ;;
    *.Z)                uncompress "$1"     ;;
    *.gpg)        gpg -d "$1" | tar -xvzf - ;;
    *) echo "Error: failed to extract '$1'" ;;
esac
</code>
<code bash pk.sh>
#!/bin/sh
case $1 in
    txz)    tar cJvf "$2.tar.xz" "$2"               ;;
    tbz)    tar cjvf "$2.tar.bz2" "$2"              ;;
    tgz)    tar czvf "$2.tar.gz" "$2"               ;;
    tar)    tar cpvf "$2.tar" "$2"                  ;;
    bz2)    bzip2 "$2"                              ;;
    gz)     gzip -c -9 -n "$2" > "$2.gz"            ;;
    zip)    zip -r "$2.zip" "$2"                    ;;
    7z)     7z a "$2.7z" "$2"                       ;;
    *)      echo "'$1' cannot be packed via pk()"   ;;
esac

</code>

===== Spell checking a website =====
This was by request.  A user had a website and wanted to run spell check on it.  This is simple, just run:
<code bash>
aspell -H -c filename.php
</code>
The ''-c'' asks aspell to check, and the ''-H'' prepares it for HTML (it skips class names and php tags etc).

aspell only takes one filename at a time, but you can run through each file in a loop using:
<code bash>
for i in *.php; do aspell -c $i; done
</code>