Solaris OS Interview Questions (grep)

Solaris OS Interview Questions

List the files in current directory sorted by size ?
```
- ls -l | grep ^- | sort -nr
```
List the hidden files in current directory ?
```
- ls -a1 | grep "^\."
```

Delete blank lines in a file ?

- cat sample.txt | grep -v ‘^$’ > new_sample.txt

Search for a sample string in particular files ?
```
- grep .Debug. *.conf
```
Here grep uses the string .Debug. to search in all files with extension..conf. under current directory.
Display the last newly appending lines of a file during appendingdata to the same file by some processes ?
```
- tail .f Debug.log
```
Here tail shows the newly appended data into Debug.log by some processes/user.
Display the Disk Usage of file sizes under each directory in currentDirectory ?
```
- du -k * | sort .nr (or) du .k . | sort -nr
```
Change to a directory, which is having very long name ?
```
- cd CDMA_3X_GEN*
```
Here original directory name is . CDMA_3X_GENERATION_DATA..
Display the all files recursively with path under current directory ?
```
- find . -depth -print
```
Set the Display automatically for the current new user ?
```
- export DISPLAY=`eval ‘who am i | cut -d"(" -f2 | cut
-d")" -f1′`
```
Here in above command, see single quote, double quote, grave ascent is used. Observe carefully.
Display the processes, which are running under yourusername ?
```
- ps .aef | grep gould
```
Here, gould is the username.
List some Hot Keys for bash shell ? - Ctrl+l . Clears the Screen. Ctrl+r . Does a search in previously given commands in shell. Ctrl+u - Clears the typing before the hotkey. Ctrl+a . Places cursor at the beginning of the command at shell. Ctrl+e . Places cursor at the end of the command at shell. Ctrl+d . Kills the shell. Ctrl+z . Places the currently running process into background.
Display the files in the directory by file size ?
```
- ls .ltr | sort .nr .k 5
```
How to save man pages to a file ?
```
- man <command> | col .b > <output-file>
```
Example : man top | col .b > top_help.txt
How to know the date & time for . when script is executed ? - Add the following script line in shell script.eval echo "Script is executed at `date`" >> timeinfo.inf
Here, .timeinfo.inf. contains date & time details ie., when script is executed and history related to execution.
How do you find out drive statistics ?
```
- iostat -E
```
Display disk usage in Kilobytes ?
```
- du -k
```
Display top ten largest files/directories ?
```
- du -sk * | sort -nr | head
```
How much space is used for users in kilobytes ?
```
- quot -af
```
How to create null file ?
```
- cat /dev/null > filename1
```
Access common commands quicker ?
```
- ps -ef | grep -i $@
```
Display the page size of memory ?
```
- pagesize -a
```
Display Ethernet Address arp table ?
```
- arp -a
```
Display the no.of active established connections to localhost ?
```
- netstat -a | grep EST
```
Display the state of interfaces used for TCP/IP traffice ?
```
- netstat -i
```
Display the parent/child tree of a process ?
```
- ptree <pid> 
```
Example: ptree 1267
Show the working directory of a process ?
```
- pwdx <pid> 
```
Example: pwdx 1267
Display the processes current open files ?
```
- pfiles <pid> 
```
Example: pfiles 1267
Display the inter-process communication facility status ? - ipcs
Display the top most process utilizing most CPU ?
```
- top .b 1 
```
Alternative for top command ? - prstat -a