Top 3. 0 UNIX command Interview Questions asked in Investment Banks. UNIX Interview Questions and Answers. UNIX or Linux operating system has become default Server operating system and for whichever programming job you give interview you find some UNIX command interview questions there. These UNIX command interview questions are mostly asked during Java development and Support role interviews on various investment banks mostly because most of electronic trading systems or stock trading system works on Unix servers. As we know that high volume low latency systems which wants to take advantage of little bit of volatility in market for Equity, Futures and options or Foreign exchange trading need a stable server side operating system and Redhat Linux is doing great job there. Article-Images/0523en_abr2_21.png' alt='How To Install Tcsh On Aix' title='How To Install Tcsh On Aix' />Algorithmic trading this speed factor becomes more important so getting someone who has good knowledge of operating system and commands on which these trading system runs is definitely required. UNIX command interview questions are equally applicable for any job interview which requires some work on Unix Operating System. With the growing use of Linux in form of Red. Hat, Solaris and IBM AIX its must to keep you familiar with essential Linux commands available on various platforms. Beginners UNIX Interview Questions Answers. Write command to list all the links from a directoryBuilding and Installing ACE and Its Auxiliary Libraries and Services Synopsis The file explains how to build and install ACE, its Network Services, test suite and. Oci8 php. oci8 oci8. Reference article for the vas. In this UNIX command interview questions interviewer is generally checking whether user knows basic use of ls grep and regular expression etc. You can write command like 2. Create a read only file in your home directory This is a simple UNIX command interview questions where you need to create a file and change its parameter to read only by using chmod command you can also change your umask to create read only file. Open source command line data stream compressor and archiver. Default lp,uucp,nuucp ., ,. MKS Toolkit Customer Support Website. For Integrity Solution or Implementer Support, please visit www. How To Install Tcsh On Aix RoseHow will you find which operating system your system is running on in UNIX By using command uname ain UNIX4. How will you run a process in backgroundHow will you bring that into foreground and how will you kill that process For running a process in background use in command line. For bringing it back in foreground use command fg jobidand for getting job id you use command jobs, for killing that process find PID and use kill 9 PID command. This is indeed a good Unix Command interview questions because many of programmer not familiar with background process in UNIX. How do you know if a remote host is alive or not You can check these by using either ping or telnet command in UNIX. This question is most asked in various Unix command Interview because its most basic networking test anybody wants to do it. How do you see command line history in UNIX Very useful indeed, use history command along with grep command in UNIX to find any relevant command you have already executed. Purpose of this Unix Command Interview Questions is probably to check how familiar candidate is from available tools in UNIX operation system. How do you copy file from one host to other Many options but you can say by using scp command. You can also use rsync command to answer this UNIX interview question or even sftp would be ok. How do you find which process is taking how much CPU By using top command in UNIX, there could be multiple follow up UNIX command interview questions based upon response of this because TOP command has various interactive options to sort result based upon various parameter. How do you check how much space left in current drive By using df command in UNIX. For example df h. This is part of anyone day to day activity so I think this Unix Interview question will be to check anyone who claims to working in UNIX but not really working on it. What is the difference between Swapping and PagingSwapping Whole process is moved from the swap device to the main memory for execution. Process size must be less than or equal to the available main memory. It is easier to implementation and overhead to the system. Swapping systems does not handle the memory more flexibly as compared to the paging systems. Paging Only the required memory pages are moved to main memory from the swap device for execution. Process size does not matter. Gives the concept of the virtual memory. It provides greater flexibility in mapping the virtual address space into the physical memory of the machine. Allows more number of processes to fit in the main memory simultaneously. Allows the greater process size than the available physical memory. Demand paging systems handle the memory more flexibly. Intermediate UNIX Interview Questions Answers. What is difference between ps ef and ps auxwww How do you find how many cpu are in your system and there details By looking into file etccpuinfo for example you can use below command 3. What is difference between Hard. Link and Soft. Link in UNIX What is Zombie process in UNIX How do you find Zombie process in UNIXWhen a program forks and the child finishes before the parent, the kernel still keeps some of its information about the child in case the parent might need it for example, the parent may need to check the childs exit status. To be able to get this information, the parent calls wait In the interval between the child terminating and the parent calling wait, the child is said to be a zombie If you do ps, the child will have a Z in its status field to indicate this. Zombie The process is dead but have not been removed from the process table. What is chmod command What do you understand by this line r w x UNIX. The line you see shows the permission for three different set of people user, group and others. User is the currently logged in user, while group is for all other member which are part of certain group and others means anyone other than user and group member. Each group has three permissions rwx stands for read, write and execute and they are written as usergroupothers. So in above line, user has only read permission, group members has write permissions and other people has only execute permission. If it is a directory then you need execute permission to go inside that directory. See here for more detailed answer. There is a file some where in your system which contains word Unix. Command. Interview. Questions How will find that file in Unix In a file word UNIX is appearing many times How will you count numberHow do you set environment variable which will be accessible form sub shell By using export command,  for example export count1 will be available on all sub shell. How do you check if a particular process is listening on a particular port on remote hostBy using telnet command for example telnet hostname port, if it able to successfully connect then some process is listening on that port. To read more about telnet read networking command in UNIX1. How do you find whether your system is 3. Either by using uname a command or by using arch command. Advanced UNIX Interview Questions and Answers. How do you find which processes are using a particular file By using lsofcommand in UNIX. It wills list down PID of all the process which is using a particular file. How do you find which remote hosts are connecting to your host on a particular port say 1. By using netstat commandexecute netstat a grep port and it will list the entire host which is connected to this host on port 1. What is nohup in UNIX An UNIX process started with nohup will not stop even if the user who has stared log off from system. La page daccueil de gzipgzip 1. Un dbordement de tampon peut tre. Certains serveurs ftp permettent une compression la vole et. Des dtails techniques sont disponibles. Ce patch pour gzip 1. La version beta. 1. GO. Une nouvelle version officielle de g GNU zip est un programme de compression destin. Ses principaux avantages sur. Il a t adopt par le. GNU et est maintenant. Internet. gzip a t crit par. Jean loup Gaillyjloupg Mark Adler pour. La dtection du. format dentre est automatique. Le format des fichiers. RFCs Request For Comments. Des informations supplmentaires sur le format g Une brve description des algorithmes de compression et. Une introduction plus informelle crite par Antaeus Feldspar est. Si vous avez une question propos de gzip, cherchez dabord. Si vous ne la trouvez pas, crivez. Donnez des informations aussi dtailles que possible, au minimum le. Windows XP, Linux., la. Si vous dites seulement gzip ne marche pas. Les sources C de gzip sont disponibles ici en plusieurs formats. Appuyez sur la touche MAJ puis cliquez sur un lien pour tlcharger. Vous pouvez aussi obtenir ces fichiers de nombreux. Pour extraire des fichiers. Windows 9xNT2. 00. MEXP, utilisez. 7 zip gratuit ou. Power. Archiver commercial ou. Winzip commercial. MSDOS ou dautres systmes, consultez la liste. FAQ du groupe comp. Pour extraire. gzip 1. Unix, tapez. tar xvf gzip 1. Sur plusieurs systmes, des erreurs du compilateur causent des. Voir la section Special targets la fin du fichier INSTALL pour la. Pour toutes les machines, utilisez. Essayez sans aucune optimisation si vous avez un problme. Le manuel utilisateur de gzip est disponible en anglais. Excutables. Des excutables pour different systmes sont disponibles ici. Pour Linux ou Be. OS, gzip est dj sur votre systme. Pour extraire des fichiers tar. Z sur Unix. zcat fichier. Z tar xvf. Foire Aux Questionsgunzip se plaint dune erreur de CRC9. ASCII au lieu du mode BINARY. En particulier, gopher est connu pour corrompre des fichiers binaires. ASCII. Verifiez que votre copie locale. Si vous avez transfr un fichier en mode ASCII et vous navez plus. CR. carriage return insrs par le transfert. Un excutable pour Windows 9xNT2. MEXP est ici. Mais il ny a absoluement. Conclusion. ne transfrez jamais un fichier binaire en mode ASCII. Pour compiler. fixgz et lxcuter, faites. Cest le mme problme que ci dessus un transfert fait en. Transfrez le fichier. Ou est gunzip pour MSDOS ou Windows La distribution de gzip pour MSDOS contient un fichier README. DOS. lisez le. En bref. Y a t il une interface Windows pour gzip Power. Archiver et. Winzip peuvent dcompresser des. Win GZ peut compresser et dcompresser les fichiers au format g Notez que gzip, 7 zip et Win GZ sont. Winzip ou Power. Archiver pour une. Puis je adapter les sources de gzip pour effectuer la. Utilisez plutt la librairie de compression. Comment extraire un fichier tar. Les fichiers avec extension tar. Sur un. systme Unix on peut les extraire avec. Pour Windows 9xNT2. MEXP, utilisez. 7 zip gratuit ou. Power. Archiver commercial ou. Winzip commercial. Broken pipe. Si vous utilisez les commandes ci dessus pour extraire un fichier. Broken pipe. Ceci peut tre ignor sans problme. Lorigine de ce message est que tar sarrte de lire. Ce problme narrive quavec certains shells, principalement. Ces shells transmettent le signal SIGPIPE. Vous pouvez facilement reproduire le mme message derreur avec des. Certains fichiers tar. Ceci arrive en particulier quand le fichier tar. Quand de tels fichiers sont extraits. Puisque ces zros ne sont pas au format g La commande dextraction tar. Vous pouvez viter ce message innofensif en utilisant loption. GZIP q gtar xvzf devrmt0 pour bash, ksh, sh. GZIP q gtar xvzf devrmt0 pour csh, tcsh,. Mon disque dur a des mauvais secteurs. Puis je rcuprer mes. Vous le savez dj, mais laissez moi le rpter rien ne remplace. Si vous utilisez gzip pour des sauvegardes. Pour tester un fichier tar. GNU tar tar tvfz fichier. Si vous transfrez le fichier tar. Ceci mettra en vidence les mauvais transferts. Si vous. nutilisez pas tar, faites au moins gzip tv fichier. Une fois le fichier endommag, il est trs difficile sinon impossible. Si vos donnes sont si importantes que vous soyez. Oui, mais il faut dabord appliquer ce patch. Voir la section excutables. Les fichiers dj compresss sans le patch sont. La dcompression avec zcat produit les donnes. Par exemple vous pouvez. Pour obtenir un binaire corrig, copiez le fichier 4g patch. Pour certains systmes Solaris 2. AIX, vous pouvez avoir le message. Value too large for defined data type. Une version complte. Paul Eggert. Pour AIX, ajoutez. DPOSIXSOURCE DLARGEFILES DLARGEFILEAPI aux options de. Et les brevets gzip a t conu comme un remplacement pour compress. UNISYS et dIBM couvrant lalgorithme. LZW utilis par compress. Jai probablement pass plus de temps tudier les brevets. Je maintiens. une liste de plusieurs centaines de brevets sur des algorithmes. En particulier, loption. La premire version de lalgorithme de compression utilis par. Juillet 1. 99. 1. Donc tout. brevet obtenu aprs le 1. Juillet 1. 99. 2 ne peut pas menacer. Pendant ma recherche, jai trouv deux brevets intressants sur. Ceci est peu prs quivalent aux brevets sur les. Jetez un oeil. en anglais pour voir une courte. Lan 2. 00. 0 gzip gre correctement les dates de lan 2. Des informations supplmentaires sur les logiciels GNU et lan 2. Erreur de compilation pour utimbuf. Sur les systmes comme AIX qui dclarent utimbuf dans unistd. CFLAGS UHAVEUNISTDH. Je ne peux pas compiler gzip sur Solaris. Il faut un compilateur pour compiler gzip and gzip pour. Pour sortir de ce problme de poule et doeuf, installez. Solaris. i. 38. 6. Voir galement ici. Non. Les algorithmes de cryptage simples tels que celui de. PKZIP peuvent tre. Et ajouter gzip du cryptage serieux tel que celui de. PGP utilise dj le code de compression de. PGP si vous avez besoin de compression et. Mais lutilisation de PGP est. France. Voir aussi la chronique. Si du cryptage faible vous suffit, vous pouvez utiliser. Pas directement. Vous pouvez crer dabord un fichir tar puis. GNU tar gtar cvzf fichier. Vous pouvez aussi utiliser. Cheaters For Scramble With Friends here. Power. Archiver commercial. Winzip commercial. Non. Utilisez unzip la. Pour Windows, utilisez. Winzip ou. Power. Archiver commerciaux. Liens. La page de lauteur de g Jean loup Gailly. La page du co auteur. La librairie galement. Jean loup et Mark. Tout ceci a commenc avec le projet. FAQ Foire Aux Questions du groupe de news. Merci beaucoup pour le support du domaine g Merci Greg Roelofs. La page daccueil de gzip en franais est. Dernire modification 2. Envoyez vos commentaires. La cl PGP de Jean loup Gailly est ici. Retour lindex. Retour la page de Jean loup Gailly.