Q: How to delete files older than N number of days ? (Useful in delete log, trace, tmp file )
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find . -name ‘*.*’ -mtime +[N in days] -exec rm {} \; ( This command will delete files older then N days in that directory, always good to use it when you are in applcsf/ tmp,out,log directory)
Q: How to list files modified in last N days
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find . -mtime -<ndays> -exec ls -lt {} \;
So to find files modified in last 3 days
===========================
find . -mtime -3 -exec ls -lt {} \;
Q: How to sort files based on Size of file ? ( useful to find large files in log directory to delete in case disk is full )
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ls -l | sort -nrk 5 | more
Q: How to find files changed in last N days (Solaris)
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find <dir_name> -mtime -N -print
Q: How to extract cpio file
==================
cpio -idmv < file_name (Don’t forget to use sign < before file name)
Q: How to find CPU & Memory detail of linux
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cat /proc/cpuinfo (CPU)
cat /proc/meminfo (Memory)
Q: How to find if Operating system in 32 bit or 64 bit ?
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For solaris use command
isainfo -v
If you see out put like
32-bit sparc applications
That means your O.S. is only 32 bit
but if you see output like
64-bit sparcv9 applications
32-bit sparc applications
above means your o.s. is 64 bit & can support both 32 & 64 bit applications
Q: How to find if any service is listening on particular port or not ?
============================================
netstat -an | grep {port no}
For example if you know that OID is running on 389 port so to check if OID services is listening or not then use
netstat -an | grep 389
Q: How to find Process ID (PID) associated with any port ?
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This command is useful if any service is running on a particular port (389, 1521..) and that is run away process which you wish to terminate using kill command
lsof | grep {port no.} (lsof should be installed and in path)
Q: How to change a particular pattern in a file ?
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Open file using vi or any other editor, go in escape mode (by pressing escape) and use
:1,$s/old_pattern/new_parameter/gc ( g will change globally, c will ask for confirmation before changing )
Q: How to find a pattern in some file in a directory ?
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grep
pattern
file_name ( to find pattern in particular file )
grep
pattern
* ( in all files in that directory )
If you know how to find a pattern in files in that directory recursively please answer that as comment
Q: How to create symbolic link to a file ?
================================
ln -s
pointing_to symbolic_name
e.g. If you want to create symbolic link from a -> b
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ln -s b a
(Condition:you should have file b in that directory & there should not be any file with name a)
Q: How to setup cronjob (cronjob is used to schedule job in Unix at O.s. Level )
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crontab -l( list current jobs in cron)
crontab -e ( edit current jobs in cron)
_1_ _2_ _3_ _4_ _5_ executable_or_job
Where
1 – Minutes (0-59)
2 – Hours ( 0-24)
3 – day of month ( 1- 31 )
4 – Month ( 1-12)
5 – A day of week ( 0- 6 ) 0 -> sunday 1-> monday
find port number:
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tnsping SID
FNDCPASS:
---------------
FNDCPASS apps/XYZ123 0 Y system/ABC123 USER SYSADMIN <NEW PASSWORD>
CHECK ERROR:
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$cat CELPAY_PATCH.20130202.205019.log | grep error
CMGR STATUS:
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ps -ef | grep aptbgale | grep FNDLIBR* | wc -l
check backup status:
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V$RMAN_BACKUP_JOB_DETAILS
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