I am trying to run a lex program in linux mint.I saved that file as abc.l,now i am trying to compile this file in the terminal by typing the following commands:
vi abc.l
lex abc.l
gcc lex.yy.c -lfl
but after the last command it is saying that no such file or directory.
please help me out in running the program.
First of all check if you have installed Lex on your system by doing a "man lex" .
If not installed,you need to install Lex & Yacc tools by typing these in the command prompt
$sudo apt-get install flex
$sudo apt-get install bison
For compiling try this command,
$ cc -w lex.yy.c -ll
Then to run the actual program,type
$./a.out
Related
When I try to execute sudo opensnoop-bpfcc I get this message:
In file included from /virtual/main.c:4:
In file included from include/linux/sched.h:14:
In file included from include/linux/pid.h:5:
In file included from include/linux/rculist.h:11:
In file included from include/linux/rcupdate.h:40:
In file included from include/linux/preempt.h:81:
In file included from ./arch/x86/include/asm/preempt.h:7:
In file included from include/linux/thread_info.h:38:
In file included from ./arch/x86/include/asm/thread_info.h:53:
./arch/x86/include/asm/cpufeature.h:150:2: warning: "Compiler lacks ASM_GOTO support. Add -D __BPF_TRACING__ to your compiler arguments"
[-W#warnings]
#warning "Compiler lacks ASM_GOTO support. Add -D __BPF_TRACING__ to your compiler arguments"
^
1 warning generated.
Traceback (most recent call last):
File "/usr/sbin/opensnoop-bpfcc", line 127, in <module>
b.attach_kprobe(event="sys_open", fn_name="trace_entry")
File "/usr/lib/python2.7/dist-packages/bcc/__init__.py", line 526, in attach_kprobe
raise Exception("Failed to attach BPF to kprobe")
Exception: Failed to attach BPF to kprobe
I don't understand how to fix it. I've just installed bcc tools using this command
sudo apt-get install bpfcc-tools linux-headers-$(uname -r)
as suggested on the github page https://github.com/iovisor/bcc/blob/master/INSTALL.md#ubuntu---binary
The running OS is 18.04.2 LTS (Bionic Beaver).
I had to compile bcc from source code instead of installing it using the package.
Install linux kernel headers
sudo apt install linux-headers-$(uname -r)
Install required dependencies
sudo apt-get -y install bison build-essential cmake flex git libedit-dev \ libllvm6.0 llvm-6.0-dev libclang-6.0-dev python zlib1g-dev libelf-dev
Compile bcc from source code
git clone https://github.com/iovisor/bcc.git
mkdir bcc/build; cd bcc/build
cmake .. -DCMAKE_INSTALL_PREFIX=/usr
make
sudo make install
#Maicake is right. Compiling and installing from source did work for me. Here are the steps to install on Ubuntu 22.04:
Follow the steps described here. Specifically for Ubuntu 22.04 you may need to make some changes after cloning the bcc repository.
Add the following line to your .bashrc file:
export PATH=$PATH:/usr/share/bcc/tools
Create a symlink to python3 as most of the tools use python (not python3) to run the scripts.
sudo ln -s /usr/bin/python3 /usr/bin/python
I am using Linux Mint 18. I installed Python 3.5 and 3.6 using apt-get in the terminal. I can open IDLE of Python 2.7 and 3.5 using commands idle and idle3 respectively. How can I access IDLE that comes with Python 3.6?
Try the command idle3.6. python3 and idle3 are still associated with your system Python, which is 3.5.
Simply typing in idle3.6 should work just like carusot42 mentioned. If it doesn't work, perhaps you might want to see if everything else is installed correctly. Here are the steps I followed which worked perfectly fine for me. I am also running Linux Mint 18. The steps that I followed were:
Installed the prerequisites of Python. Do that by typing in the following commands -
sudo apt-get install build-essential checkinstall
sudo apt-get install libreadline-gplv2-dev libncursesw5-dev libssl-dev libsqlite3-dev tk-dev libgdbm-dev libc6-dev libbz2-dev
Download Python using the following command and extract it (use your desired location) -
cd /usr/src
wget https://www.python.org/ftp/python/3.6.1/Python-3.6.1.tgz
sudo tar xzf Python-3.6.0.tgz
The next step is to compile Python source. To do that type in the commands below-
cd Python-3.6.1
./configure
sudo make altinstall
make altinstall is used to prevent replacing the default Python binary
file /usr/bin/python
You should be good to go. You check your Python version by typing python3.6 -V in the terminal.
Once you do that, type in idle3.6 and then Python 3.6.1 shell should open for you.
The Software Manager in Linux Mint lists the Python Packages and IDLE Packages
separately. After you install Python, go look up the associated IDLE package in the Software Manager and install it. Reboot and it should work fine. It worked for me.
The instructions for madge are only good for a linux system (it requires sudo to get the command line part set up). Is there a way to run it on windows?
It turns out to be very simple. To install madge:
npm install madge
Then to set it up for the command line:
npm -g install madge
You can then run it with a command of:
madge
For typescript generate .js files do:
madge -f amd -c .
and you'll get the circular report. You need the "-f amd".
I installed casperjs for the first time and ran the sample scripts. The first sample script (javascript) ran without incident. Then i tried running a coffescript sample, which I prefer, and received the following error:
Unable to load script test.coffee; check file syntax
I searched for an answer and the solution in the only related issue didn't work for me. I was able to compile the CoffeeScript (test.coffee) into JavaScript (test.js) and then ran the compiled JavaScript, again, without indecent.
I tried to track down the error by searching for the error message in the casperjs files. I found the error message at the end the ~/.node/lib/node_modules/casperjs/bin/bootstrap.js file where it passes control to phantomjs. I created simple a CoffeeScript: test_phantomjs.coffee:
console.log "hello phantomjs"
phantom.exit()
and ran the script (phantomjs test_phantomjs.coffee) with the following result:
Can't open 'test_phantomjs.coffee'
At this point I'm at loss. The problem is more of an inconvenience than anything since compiling into JavaScript solves the issue. Is their something I'm missing?
In Phantomjs2.0 was removed support of coffee-script
https://github.com/ariya/phantomjs/issues/12410
(disclaimer: i'm/was part of contribution team)
the support of coffee script in CasperJS depends on the version of phantomJs you are using because this is phantomjs that provide coffee script support out of box.
You can also use and install slimerjs (https://slimerjs.org) which - from my point of view - is more performant than phantomjs and supports coffeescript scripts.
Mickaël
Works for me. Can you post your PhantomJS version and platform?
Mine on Mac OS X:
$ phantomjs -v
1.9.8
Just works:
$ phantomjs test_phantomjs.coffee
hello phantomjs
As others say, PhantomJS v2.x no longer supports CoffeeScript.
Therefore, now you have 2 options to run PhantomJS with CoffeeScript:
Run plain *.coffee files with PhantomJS v1.9.8
Compile *.coffee files to *.js, and run *.js with PhantomJS v2.x
I recommend the latter up-to-date way, and this is how package.json looks like:
{
"scripts": {
"pretest": "npm install && coffee --compile **/*.coffee",
"test": "casperjs test --fail-fast script/*.js",
"watch": "coffee --watch --compile **/*.coffee"
}
}
See more detail at ymkjp/phantomjs2x_coffee_sample.
Btw, here's the way to install PhantomJS v1.9.8 on Ubuntu.
$ sudo apt-get update
$ sudo apt-get install build-essential g++ flex bison gperf ruby perl \
libsqlite3-dev libfontconfig1-dev libicu-dev libfreetype6 libssl-dev \
libpng-dev libjpeg-dev python libx11-dev libxext-dev git
$ cd ~
$ wget -O- https://github.com/ariya/phantomjs/archive/1.9.8.tar.gz | tar zxvf -
$ cd ~/phantomjs-1.9.8
$ bash build.sh # It takes 30 min or so (Up to your host machine)
$ sudo ln -s ~/phantomjs-1.9.8/bin/phantomjs /usr/local/bin
$ phantomjs --version
1.9.8
Cheers.
I tried to install the "MATLAB - Scientific computing environment" from the software center but failed, because I got the error message "No MATLAB executables were found in the directories you specified. This package requires at least one local installation of MATLAB." My linux version is ubuntu 12.10. Any help will be appreciated.
Try the following:
cd /usr/local/bin/
# Replace R2012a by your version:
sudo ln -s /usr/local/MATLAB/R2012a/bin/matlab matlab
Otherwise you can also try sudo apt-get install matlab-support, which is basically an assistant for configuring MATLAB.
Now the command matlab should launch MATLAB.