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by Aman Jain
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Published on 2008-09-23T19:29:26Z
Indexed on
2010/03/25
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I was trying to remove all the lines of a file except the last line but the following command did not work, although file.txt is not empty.
$cat file.txt |tail -1 > file.txt
$cat file.txt
Why is it so?
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as seen on Ask Ubuntu
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I've got a problem with apt-get update and apt-get install ... commands .
every time update or installing fails and errors are :
Get:1 http://dl.google.com stable Release.gpg [198B]
Ign http://dl.google.com/linux/chrome/deb/ stable/main Translation-en_US
Get:2 http://dl…
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sh@ubuntu:/home/ccpp/helloworld$ make
gcc-4.6 -O2 -DMODULE -D_KERNEL_ -W -Wall -Wstrict-prototypes -Wmissing-prototypes -isystem /lib/modules/`uname -r`/build/include -c -o hello-1.o hello-1.c
hello-1.c:4:0: warning: "MODULE" redefined [enabled by default]
<command-line>:0:0: note: this is…
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I am having trouble accessing the several critical header files that show to be a part of the build process.
The "Ubuntu Software Center" shows "Build Essentials" as installed:
Next I did the following two commands, which did not improve the problem:
~$ sudo apt-get install build-essential
[sudo]…
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I'm trying to update my Debian machine to 2.6.32-46 (which is the new stable). However, after doing apt-get update my apt-cache search linux-image shows me:
linux-headers-2.6.32-5-486 - Header files for Linux 2.6.32-5-486
linux-headers-2.6.32-5-686-bigmem - Header files for Linux 2.6.32-5-686-bigmem
linux-headers-2…
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I'm helping out with a project for an embedded device that only has USB and no serial. This device is running Linux.
These days, when we need to connect to a serial port on a device we typically use a USB to serial adapter (on something like a phone system or a load balancing device, etc). I would…
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as seen on Ask Ubuntu
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When I run a program from the console, e.g.
me@box:~$ firefox
I expect the console to log error messages (I think this is std out or std err?) and other items from the program, firefox in this case.
But today I notice that bash just opens the program and goes to a new prompt, e.g.
me@box:~$…
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as seen on Ask Ubuntu
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I was updating my .bash_profile, and unfortunetly I made a few updates and now I am getting:
env: bash: No such file or directory
env: bash: No such file or directory
env: bash: No such file or directory
env: bash: No such file or directory
env: bash: No such file or directory
-bash: tar: command…
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as seen on Ask Ubuntu
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I was updating my .bash_profile, and unfortunetly I made a few updates and now I am getting:
env: bash: No such file or directory
env: bash: No such file or directory
env: bash: No such file or directory
env: bash: No such file or directory
env: bash: No such file or directory
-bash: tar: command…
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as seen on Super User
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ps -e | grep bash
sample output from a linux machine:
1128 pts/14 00:00:00 bash
7491 pts/7 00:00:00 bash
12651 pts/14 00:00:00 bash
16145 pts/2 00:00:00 bash
sample output from a mac machine:
58352 ttys000 0:00.09 login -pfl username /bin/bash -c exec -la bash /bin/bash
58353 ttys000…
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First login process name seems to be set to "-bash", but if I subshell then it becomes "bash". for example:
root@nowere:~# echo $0
-bash
root@nowere:~# bash
root@nowere:~# echo $0
bash
-bash is causing some scripts to fail, such as . /usr/share/debconf/confmodule
exec /usr/share/debconf/frontend…
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