Basically I have the following script:
#!/bin/bash
echo "What shall we set into managed mode? (e.g. wlan0)"
read thisend
sudo ifconfig $thisend down
sudo iwconfig $thisend mode managed
sudo ifconfig $thisend up
var=$(iwconfig wlan0)
What the script does (as you see) is to set the wireless card into managed mode, but I would like it to double-check at the end of the script if it actually is set in managed mode, which I'll write some comparison system for, but for now I just want to know if it's possible to strip out everything else from the output of iwconfig wlan0 except for Mode: Managed, and write the remaining output into a new variable.
var = $(iwconfig wlan0 | grep -v 'Mode: Managed')
from grep man page
-v, --invert-match
Selected lines are those not matching any of the specified patterns.
Use grep or sed to extract just the part you want.
Related
I am trying to list network interface that I am currently using. I need to know how to do this in terminal, and in script.
ifconfig | grep $(networksetup -listnetworkserviceorder | grep 'Ethernet, Device' | sed -E "s/.*(en[0-9]).*/\1/")
What am i getting:
enter image description here
What do I want to get:
Only the name of active interface
Use your second command, but put everything after the interface name into a lookahead, so it's not printed as part of the match.
ifconfig | pcregrep -M -o '^[^\t:]+(?=:([^\n]|\n\t)*status: active)'
When I do this, the output is:
en0
awdl0
See What is AWDL (Apple Wireless Direct Link) and how does it work? for what awdl0 is.
Your first command should work if just print the result of the networksetup pipeline, without using ifconfig. This works for me:
networksetup -listnetworkserviceorder | grep 'Wi-Fi, Device' | sed -E "s/.*(en[0-9]).*/\1/"
I have Wi-Fi rather than Ethernet.
You can also use the scutil command to show active interfaces and their IPv4/6 addresses (though it doesn't show the AWDL interfaces):
scutil --nwi
I need to resolve a host name to an IP address in a shell script. The code must work at least in Cygwin, Ubuntu and OpenWrt(busybox).
It can be assumed that each host will have only one IP address.
Example:
input
google.com
output
216.58.209.46
EDIT:
nslookup may seem like a good solution, but its output is quite unpredictable and difficult to filter. Here is the result command on my computer (Cygwin):
>nslookup google.com
Unauthorized answer:
Serwer: UnKnown
Address: fdc9:d7b9:6c62::1
Name: google.com
Addresses: 2a00:1450:401b:800::200e
216.58.209.78
I've no experience with OpenWRT or Busybox but the following one-liner will should work with a base installation of Cygwin or Ubuntu:
ipaddress=$(LC_ALL=C nslookup $host 2>/dev/null | sed -nr '/Name/,+1s|Address(es)?: *||p')
The above works with both the Ubuntu and Windows version of nslookup. However, it only works when the DNS server replies with one IP (v4 or v6) address; if more than one address is returned the first one will be used.
Explanation
LC_ALL=C nslookup sets the LC_ALL environment variable when running the nslookup command so that the command ignores the current system locale and print its output in the command’s default language (English).
The 2>/dev/null avoids having warnings from the Windows version of nslookup about non-authoritative servers being printed.
The sed command looks for the line containing Name and then prints the following line after stripping the phrase Addresses: when there's more than one IP (v4 or 6) address -- or Address: when only one address is returned by the name server.
The -n option means lines aren't printed unless there's a p commandwhile the-r` option means extended regular expressions are used (GNU sed is the default for Cygwin and Ubuntu).
If you want something available out-of-the-box on almost any modern UNIX, use Python:
pylookup() {
python -c 'import socket, sys; print socket.gethostbyname(sys.argv[1])' "$#" 2>/dev/null
}
address=$(pylookup google.com)
With respect to special-purpose tools, dig is far easier to work with than nslookup, and its short mode emits only literal answers -- in this case, IP addresses. To take only the first address, if more than one is found:
# this is a bash-specific idiom
read -r address < <(dig +short google.com | grep -E '^[0-9.]+$')
If you need to work with POSIX sh, or broken versions of bash (such as Git Bash, built with mingw, where process substitution doesn't work), then you might instead use:
address=$(dig +short google.com | grep -E '^[0-9.]+$' | head -n 1)
dig is available for cygwin in the bind-utils package; as bind is most widely used DNS server on UNIX, bind-utils (built from the same codebase) is available for almost all Unix-family operating systems as well.
Here's my variation that steals from earlier answers:
nslookup blueboard 2> /dev/null | awk '/Address/{a=$3}END{print a}'
This depends on nslookup returning matching lines that look like:
Address 1: 192.168.1.100 blueboard
...and only returns the last address.
Caveats: this doesn't handle non-matching hostnames at all.
TL;DR; Option 2 is my preferred choice for IPv4 address. Adjust the regex to get IPv6 and/or awk to get both. There is a slight edit to option 2 suggested use given in EDIT
Well a terribly late answer here, but I think I'll share my solution here, esp. because the accepted answer didn't work for me on openWRT(no python with minimal setup) and the other answer errors out "no address found after comma".
Option 1 (gives the last address from last entry sent by nameserver):
nslookup example.com 2>/dev/null | tail -2 | tail -1 | awk '{print $3}'
Pretty simple and straight forward and doesn't really need an explanation of piped commands.
Although, in my tests this always gave IPv4 address (because IPv4 was always last line, at least in my tests.) However, I read about the unexpected behavior of nslookup. So, I had to find a way to make sure I get IPv4 even if the order was reversed - thanks regex
Option 2 (makes sure you get IPv4):
nslookup example.com 2>/dev/null | sed 's/[^0-9. ]//g' | tail -n 1 | awk -F " " '{print $2}'
Explanation:
nslookup example.com 2>/dev/null - look up given host and ignore STDERR (2>/dev/null)
sed 's/[^0-9. ]//g' - regex to get IPv4 (numbers and dots, read about 's' command here)
tail -n 1 - get last 1 line (alt, tail -1)
awk -F " " '{print $2} - Captures and prints the second part of line using " " as a field separator
EDIT: A slight modification based on a comment to make it actually more generalized:
nslookup example.com 2>/dev/null | printf "%s" "$(sed 's/[^0-9. ]//g')" | tail -n 1 | printf "%s" "$(awk -F " " '{print $1}')"
In the above edit, I'm using printf command substitution to take care of any unwanted trailing newlines.
Good day. I was reading another post regarding resolving hostnames to IPs and only using the first IP in the list.
I want to do the opposite and used the following script:
#!/bin/bash
IPLIST="/Users/mymac/Desktop/list2.txt"
for IP in 'cat $IPLIST'; do
domain=$(dig -x $IP +short | head -1)
echo -e "$domain" >> results.csv
done < domainlist.txt
I would like to give the script a list of 1000+ IP addresses collected from a firewall log, and resolve the list of destination IP's to domains. I only want one entry in the response file since I will be adding this to the CSV I exported from the firewall as another "column" in Excel. I could even use multiple responses as semi-colon separated on one line (or /,|,\,* etc). The list2.txt is a standard ascii file. I have tried EOF in Mac, Linux, Windows.
216.58.219.78
206.190.36.45
173.252.120.6
What I am getting now:
The domainlist.txt is getting an exact duplicate of list2.txt while the results has nothing. No error come up on the screen when I run the script either.
I am running Mac OS X with Macports.
Your script has a number of syntax and stylistic errors. The minimal fix is to change the quotes around the cat:
for IP in `cat $IPLIST`; do
Single quotes produce a literal string; backticks (or the much preferred syntax $(cat $IPLIST)) performs a command substitution, i.e. runs the command and inserts its output. But you should fix your quoting, and preferably read the file line by line instead. We can also get rid of the useless echo.
#!/bin/bash
IPLIST="/Users/mymac/Desktop/list2.txt"
while read IP; do
dig -x "$IP" +short | head -1
done < "$IPLIST" >results.csv
Seems that in your /etc/resolv.conf you configured a nameserver which does not support reverse lookups and that's why the responses are empty.
You can pass the DNS server which you want to use to the dig command. Lets say 8.8.8.8 (Google) for example:
dig #8.8.8.8 -x "$IP" +short | head -1
The commands returns the domain with a . appended. If you want to replace that you can additionally pipe to sed:
... | sed 's/.$//'
Does anyone know of any possible way to determine or glean this information from the terminal (in order to use in a bash shell script)?
On my Macbook Air, via the GUI I can go to "About this mac" > "Displays" and it tells me:
Built-in Display, 13-inch (1440 x 900)
I can get the screen resolution from the system_profiler command, but not the "13-inch" bit.
I've also tried with ioreg without success. Calculating the screen size from the resolution is not accurate, as this can be changed by the user.
Has anyone managed to achieve this?
I think you could only get the display model-name which holds a reference to the size:
ioreg -lw0 | grep "IODisplayEDID" | sed "/[^<]*</s///" | xxd -p -r | strings -6 | grep '^LSN\|^LP'
will output something like:
LP154WT1-SJE1
which depends on the display manufacturer. But as you can see the first three numbers in this model name string imply the display-size: 154 == 15.4''
EDIT
Found a neat solution but it requires an internet connection:
curl -s http://support-sp.apple.com/sp/product?cc=`system_profiler SPHardwareDataType | awk '/Serial/ {print $4}' | cut -c 9-` |
sed 's|.*<configCode>\(.*\)</configCode>.*|\1|'
hope that helps
The next script:
model=$(system_profiler SPHardwareDataType | \
/usr/bin/perl -MLWP::Simple -MXML::Simple -lane '$c=substr($F[3],8)if/Serial/}{
print XMLin(get(q{http://support-sp.apple.com/sp/product?cc=}.$c))->{configCode}')
echo "$model"
will print for example:
MacBook Pro (13-inch, Mid 2010)
Or the same without perl but more command forking:
model=$(curl -s http://support-sp.apple.com/sp/product?cc=$(system_profiler SPHardwareDataType | sed -n '/Serial/s/.*: \(........\)\(.*\)$/\2/p')|sed 's:.*<configCode>\(.*\)</configCode>.*:\1:')
echo "$model"
It is fetched online from apple site by serial number, so you need internet connection.
I've found that there seem to be several different Apple URLs for checking this info. Some of them seem to work for some serial numbers, and others for other machines.
e.g:
https://selfsolve.apple.com/wcResults.do?sn=$Serial&Continue=Continue&num=0
https://selfsolve.apple.com/RegisterProduct.do?productRegister=Y&country=USA&id=$Serial
http://support-sp.apple.com/sp/product?cc=$serial (last 4 digits)
https://selfsolve.apple.com/agreementWarrantyDynamic.do
However, the first two URLs are the ones that seem to work for me. Maybe it's because the machines I'm looking up are in the UK and not the US, or maybe it's due to their age?
Anyway, due to not having much luck with curl on the command line (The Apple sites redirect, sometimes several times to alternative URLs, and the -L option doesn't seem to help), my solution was to bosh together a (rather messy) PHP script that uses PHP cURL to check the serials against both URLs, and then does some regex trickery to report the info I need.
Once on my web server, I can now curl it from the terminal command line and it's bringing back decent results 100% of the time.
I'm a PHP novice so I won't embarrass myself by posting the script up in it's current state, but if anyone's interested I'd be happy to tidy it up and share it on here (though admittedly it's a rather long winded solution to what should be a very simple query).
This info really should be simply made available in system_profiler. As it's available through System Information.app, I can't see a reason why not.
Hi there for my bash script , under GNU/Linux : I make the follow to save
# Resolution Fix
echo `xrandr --current | grep current | awk '{print $8}'` >> /tmp/width
echo `xrandr --current | grep current | awk '{print $10}'` >> /tmp/height
cat /tmp/height | sed -i 's/,//g' /tmp/height
WIDTH=$(cat /tmp/width)
HEIGHT=$(cat /tmp/height)
rm /tmp/width /tmp/height
echo "$WIDTH"'x'"$HEIGHT" >> /tmp/Resolution
Resolution=$(cat /tmp/Resolution)
rm /tmp/Resolution
# Resolution Fix
and the follow in the same script for restore after exit from some app / game
in some S.O
This its execute command directly
ResolutionRestore=$(xrandr -s $Resolution)
But if dont execute call the variable with this to execute the varible content
$($ResolutionRestore)
And the another way you can try its with the follow for example
RESOLUTION=$(xdpyinfo | grep -i dimensions: | sed 's/[^0-9]*pixels.*(.*).*//' | sed 's/[^0-9x]*//')
VRES=$(echo $RESOLUTION | sed 's/.*x//')
HRES=$(echo $RESOLUTION | sed 's/x.*//')
I'm testing mobile Android devices and I would like to redirect the device log on a file whose name indicates both the date and time of my test, and the device model that is being tested.
For the first issue, I have already resolved with
now=$(date +"%b_%d_%Y_%k_%M");adb logcat -c;adb logcat|tee $now
So:
$ echo $now
Jan_03_2012_13_09
and the tee command creates a file with this filename.
As for the device model I have written two bash lines that obtain it from adb shell, namely
device=$(adb shell cat /system/build.prop | grep "^ro.product.device=")
deviceshortname=$(echo $device | sed 's/ro.product.device=//g')
(not optimal as I am not very good in bash programming... :) but I manage to get
$ echo $deviceshortname
LT15i
My problem is how to combine $now and $deviceshortname to obtain a filename such as:
LT15i_Jan_03_2012_13_19
I tried to set another variable:
filename=($(echo $deviceshortname"_"$now))
and got:
$ echo $filename
LT15i_Jan_03_2012_13_19
but if I try redirecting the log:
$ adb logcat | tee $filename
I obtain such file:
-rw-r--r--+ 1 ele None 293 Jan 3 13:21 ?[01;31m?[K?[m?[KLT15i_Jan_03_2012_13_19
I don't know why these strange characters and what I'm doing wrong.
Something is adding color to your output. It might be grep(1), it might adb, it might be baked into the /system/build.prop resource that you're reading.
If you're lucky, it is being added by grep(1) -- because that is supremely easy to disable with --color=no:
device=$(adb shell cat /system/build.prop | grep --color=no "^ro.product.device=")
deviceshortname=$(echo $device | sed 's/ro.product.device=//g')
If the colors are being added by adb, then perhaps it has a command line option that asks it to avoid colorizing the output.
If the colors are hard-coded into the /sys/build.prop resource in some way, then you'll need some little tool that filters out the color codes. I don't have one handy (and it's bedtime) but you can probably build one starting with tr(1) to delete \033 ASCII ESC characters.
Looks like an ANSI sequence used by adb to color the output.
I'm not sure if I'm missing something, but this works for me
p1=foo
p2=$(date +%d_%m_%Y)
cat sample_file.txt | tee $p1"_"$p2
Just type: echo ${deviceshortname}${now} and it will do the trick.