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bash: Shell Script Wrapper Examples: Enhance the Ping and Host Commands

#!/bin/bash
## Note: Only works with bash 3.x or 4.x+ ##
## source: http://www.cyberciti.biz/tips/unix-linux-bash-shell-script-wrapper-examples.html

# Instead of using /bin/ping in order to get real ‘ping’, you can use the command shell bultiin:
# command ping  --> Run command with arguments ignoring any shell function named command. 
# http://ss64.com/bash/command.html


_getdomainnameonly(){
    local h="$1"
    local f="${h,,}"
    # remove protocol part of hostname
        f="${f#http://}"
        f="${f#https://}"
    f="${f#ftp://}"
    f="${f#scp://}"
    f="${f#scp://}"
    f="${f#sftp://}"
    # remove username and/or username:password part of hostname
    f="${f#*:*@}"
    f="${f#*@}"
    # remove all /foo/xyz.html*
    f=${f%%/*}
    # show domain name only
    echo "$f"
}
 
ping(){
    local array=( [email protected] )          # get all args in an array
    local len=${#array[@]}          # find the length of an array
    local host=${array[$len-1]}     # get the last arg
    local args=${array[@]:0:$len-1} # get all args before the last arg in [email protected] in an array
    #local _ping="/bin/ping"
    local c=$(_getdomainnameonly "$host")
    [ "$t" != "$c" ] && echo "Sending ICMP ECHO_REQUEST to \"$c\"..."
    # pass args and host
    #$_ping $args $c # improving script
    command ping $args $c
}
 
host(){
    local array=( [email protected] )
    local len=${#array[@]}
    local host=${array[$len-1]}
    local args=${array[@]:0:$len-1}
    #local _host="/usr/bin/host"
    local c=$(_getdomainnameonly "$host")
    [ "$t" != "$c" ] && echo "Performing DNS lookups for \"$c\"..."
    #$_host $args $c
    command host $args $c
}
 
https://snippets.siftie.com/embed/66fe99d3b3fba01d54eabf90eb024357/
/raw/66fe99d3b3fba01d54eabf90eb024357/
66fe99d3b3fba01d54eabf90eb024357
bash
Bash
55
2019-03-25T01:44:48
True
False
False
/api/public/snipt/42596/
shell-script-wrapper-examples-enhance-the-ping-and-host-commands
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><a href="#L-1"> 1</a> <a href="#L-2"> 2</a> <a href="#L-3"> 3</a> <a href="#L-4"> 4</a> <a href="#L-5"> 5</a> <a href="#L-6"> 6</a> <a href="#L-7"> 7</a> <a href="#L-8"> 8</a> <a href="#L-9"> 9</a> <a href="#L-10">10</a> <a href="#L-11">11</a> <a href="#L-12">12</a> <a href="#L-13">13</a> <a href="#L-14">14</a> <a href="#L-15">15</a> <a href="#L-16">16</a> <a href="#L-17">17</a> <a href="#L-18">18</a> <a href="#L-19">19</a> <a href="#L-20">20</a> <a href="#L-21">21</a> <a href="#L-22">22</a> <a href="#L-23">23</a> <a href="#L-24">24</a> <a href="#L-25">25</a> <a href="#L-26">26</a> <a href="#L-27">27</a> <a href="#L-28">28</a> <a href="#L-29">29</a> <a href="#L-30">30</a> <a href="#L-31">31</a> <a href="#L-32">32</a> <a href="#L-33">33</a> <a href="#L-34">34</a> <a href="#L-35">35</a> <a href="#L-36">36</a> <a href="#L-37">37</a> <a href="#L-38">38</a> <a href="#L-39">39</a> <a href="#L-40">40</a> <a href="#L-41">41</a> <a href="#L-42">42</a> <a href="#L-43">43</a> <a href="#L-44">44</a> <a href="#L-45">45</a> <a href="#L-46">46</a> <a href="#L-47">47</a> <a href="#L-48">48</a> <a href="#L-49">49</a> <a href="#L-50">50</a> <a href="#L-51">51</a> <a href="#L-52">52</a> <a href="#L-53">53</a></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span id="L-1"><a name="L-1"></a><span class="ch">#!/bin/bash</span> </span><span id="L-2"><a name="L-2"></a><span class="c1">## Note: Only works with bash 3.x or 4.x+ ##</span> </span><span id="L-3"><a name="L-3"></a><span class="c1">## source: http://www.cyberciti.biz/tips/unix-linux-bash-shell-script-wrapper-examples.html</span> </span><span id="L-4"><a name="L-4"></a> </span><span id="L-5"><a name="L-5"></a><span class="c1"># Instead of using /bin/ping in order to get real ‘ping’, you can use the command shell bultiin:</span> </span><span id="L-6"><a name="L-6"></a><span class="c1"># command ping --&gt; Run command with arguments ignoring any shell function named command. </span> </span><span id="L-7"><a name="L-7"></a><span class="c1"># http://ss64.com/bash/command.html</span> </span><span id="L-8"><a name="L-8"></a> </span><span id="L-9"><a name="L-9"></a> </span><span id="L-10"><a name="L-10"></a>_getdomainnameonly<span class="o">(){</span> </span><span id="L-11"><a name="L-11"></a> <span class="nb">local</span> <span class="nv">h</span><span class="o">=</span><span class="s2">&quot;</span><span class="nv">$1</span><span class="s2">&quot;</span> </span><span id="L-12"><a name="L-12"></a> <span class="nb">local</span> <span class="nv">f</span><span class="o">=</span><span class="s2">&quot;</span><span class="si">${</span><span class="nv">h</span><span class="p">,,</span><span class="si">}</span><span class="s2">&quot;</span> </span><span id="L-13"><a name="L-13"></a> <span class="c1"># remove protocol part of hostname</span> </span><span id="L-14"><a name="L-14"></a> <span class="nv">f</span><span class="o">=</span><span class="s2">&quot;</span><span class="si">${</span><span class="nv">f</span><span class="p">#http://</span><span class="si">}</span><span class="s2">&quot;</span> </span><span id="L-15"><a name="L-15"></a> <span class="nv">f</span><span class="o">=</span><span class="s2">&quot;</span><span class="si">${</span><span class="nv">f</span><span class="p">#https://</span><span class="si">}</span><span class="s2">&quot;</span> </span><span id="L-16"><a name="L-16"></a> <span class="nv">f</span><span class="o">=</span><span class="s2">&quot;</span><span class="si">${</span><span class="nv">f</span><span class="p">#ftp://</span><span class="si">}</span><span class="s2">&quot;</span> </span><span id="L-17"><a name="L-17"></a> <span class="nv">f</span><span class="o">=</span><span class="s2">&quot;</span><span class="si">${</span><span class="nv">f</span><span class="p">#scp://</span><span class="si">}</span><span class="s2">&quot;</span> </span><span id="L-18"><a name="L-18"></a> <span class="nv">f</span><span class="o">=</span><span class="s2">&quot;</span><span class="si">${</span><span class="nv">f</span><span class="p">#scp://</span><span class="si">}</span><span class="s2">&quot;</span> </span><span id="L-19"><a name="L-19"></a> <span class="nv">f</span><span class="o">=</span><span class="s2">&quot;</span><span class="si">${</span><span class="nv">f</span><span class="p">#sftp://</span><span class="si">}</span><span class="s2">&quot;</span> </span><span id="L-20"><a name="L-20"></a> <span class="c1"># remove username and/or username:password part of hostname</span> </span><span id="L-21"><a name="L-21"></a> <span class="nv">f</span><span class="o">=</span><span class="s2">&quot;</span><span class="si">${</span><span class="nv">f</span><span class="p">#*:*@</span><span class="si">}</span><span class="s2">&quot;</span> </span><span id="L-22"><a name="L-22"></a> <span class="nv">f</span><span class="o">=</span><span class="s2">&quot;</span><span class="si">${</span><span class="nv">f</span><span class="p">#*@</span><span class="si">}</span><span class="s2">&quot;</span> </span><span id="L-23"><a name="L-23"></a> <span class="c1"># remove all /foo/xyz.html*</span> </span><span id="L-24"><a name="L-24"></a> <span class="nv">f</span><span class="o">=</span><span class="si">${</span><span class="nv">f</span><span class="p">%%/*</span><span class="si">}</span> </span><span id="L-25"><a name="L-25"></a> <span class="c1"># show domain name only</span> </span><span id="L-26"><a name="L-26"></a> <span class="nb">echo</span> <span class="s2">&quot;</span><span class="nv">$f</span><span class="s2">&quot;</span> </span><span id="L-27"><a name="L-27"></a><span class="o">}</span> </span><span id="L-28"><a name="L-28"></a> </span><span id="L-29"><a name="L-29"></a>ping<span class="o">(){</span> </span><span id="L-30"><a name="L-30"></a> <span class="nb">local</span> <span class="nv">array</span><span class="o">=(</span> <span class="nv">[email protected]</span> <span class="o">)</span> <span class="c1"># get all args in an array</span> </span><span id="L-31"><a name="L-31"></a> <span class="nb">local</span> <span class="nv">len</span><span class="o">=</span><span class="si">${#</span><span class="nv">array</span><span class="p">[@]</span><span class="si">}</span> <span class="c1"># find the length of an array</span> </span><span id="L-32"><a name="L-32"></a> <span class="nb">local</span> <span class="nv">host</span><span class="o">=</span><span class="si">${</span><span class="nv">array</span><span class="p">[</span><span class="nv">$len</span><span class="p">-1]</span><span class="si">}</span> <span class="c1"># get the last arg</span> </span><span id="L-33"><a name="L-33"></a> <span class="nb">local</span> <span class="nv">args</span><span class="o">=</span><span class="si">${</span><span class="nv">array</span><span class="p">[@]:</span><span class="nv">0</span><span class="p">:</span><span class="nv">$len</span><span class="p">-1</span><span class="si">}</span> <span class="c1"># get all args before the last arg in [email protected] in an array</span> </span><span id="L-34"><a name="L-34"></a> <span class="c1">#local _ping=&quot;/bin/ping&quot;</span> </span><span id="L-35"><a name="L-35"></a> <span class="nb">local</span> <span class="nv">c</span><span class="o">=</span><span class="k">$(</span>_getdomainnameonly <span class="s2">&quot;</span><span class="nv">$host</span><span class="s2">&quot;</span><span class="k">)</span> </span><span id="L-36"><a name="L-36"></a> <span class="o">[</span> <span class="s2">&quot;</span><span class="nv">$t</span><span class="s2">&quot;</span> !<span class="o">=</span> <span class="s2">&quot;</span><span class="nv">$c</span><span class="s2">&quot;</span> <span class="o">]</span> <span class="o">&amp;&amp;</span> <span class="nb">echo</span> <span class="s2">&quot;Sending ICMP ECHO_REQUEST to \&quot;</span><span class="nv">$c</span><span class="s2">\&quot;...&quot;</span> </span><span id="L-37"><a name="L-37"></a> <span class="c1"># pass args and host</span> </span><span id="L-38"><a name="L-38"></a> <span class="c1">#$_ping $args $c # improving script</span> </span><span id="L-39"><a name="L-39"></a> <span class="nb">command</span> ping <span class="nv">$args</span> <span class="nv">$c</span> </span><span id="L-40"><a name="L-40"></a><span class="o">}</span> </span><span id="L-41"><a name="L-41"></a> </span><span id="L-42"><a name="L-42"></a>host<span class="o">(){</span> </span><span id="L-43"><a name="L-43"></a> <span class="nb">local</span> <span class="nv">array</span><span class="o">=(</span> <span class="nv">[email protected]</span> <span class="o">)</span> </span><span id="L-44"><a name="L-44"></a> <span class="nb">local</span> <span class="nv">len</span><span class="o">=</span><span class="si">${#</span><span class="nv">array</span><span class="p">[@]</span><span class="si">}</span> </span><span id="L-45"><a name="L-45"></a> <span class="nb">local</span> <span class="nv">host</span><span class="o">=</span><span class="si">${</span><span class="nv">array</span><span class="p">[</span><span class="nv">$len</span><span class="p">-1]</span><span class="si">}</span> </span><span id="L-46"><a name="L-46"></a> <span class="nb">local</span> <span class="nv">args</span><span class="o">=</span><span class="si">${</span><span class="nv">array</span><span class="p">[@]:</span><span class="nv">0</span><span class="p">:</span><span class="nv">$len</span><span class="p">-1</span><span class="si">}</span> </span><span id="L-47"><a name="L-47"></a> <span class="c1">#local _host=&quot;/usr/bin/host&quot;</span> </span><span id="L-48"><a name="L-48"></a> <span class="nb">local</span> <span class="nv">c</span><span class="o">=</span><span class="k">$(</span>_getdomainnameonly <span class="s2">&quot;</span><span class="nv">$host</span><span class="s2">&quot;</span><span class="k">)</span> </span><span id="L-49"><a name="L-49"></a> <span class="o">[</span> <span class="s2">&quot;</span><span class="nv">$t</span><span class="s2">&quot;</span> !<span class="o">=</span> <span class="s2">&quot;</span><span class="nv">$c</span><span class="s2">&quot;</span> <span class="o">]</span> <span class="o">&amp;&amp;</span> <span class="nb">echo</span> <span class="s2">&quot;Performing DNS lookups for \&quot;</span><span class="nv">$c</span><span class="s2">\&quot;...&quot;</span> </span><span id="L-50"><a name="L-50"></a> <span class="c1">#$_host $args $c</span> </span><span id="L-51"><a name="L-51"></a> <span class="nb">command</span> host <span class="nv">$args</span> <span class="nv">$c</span> </span><span id="L-52"><a name="L-52"></a><span class="o">}</span> </span><span id="L-53"><a name="L-53"></a> </span></pre></div> </td></tr></table>
bash, bashrc, command, host, linux, ping, shell, shell_script