Thanks to antville.org
managing crons

We can use logger command in a crontab.

59 23 * /home/john/bin/backup.sh > /home/john/logs/backup.log | logger -t backup 2>&1

It is also possible to skip the standard error and let mailto send you the errors:

MAILTO=me@domain.com

... Link (0 comments) ... Comment


Saving files in VI

You can save the current file as a new file after making changes,
:w new_file.txt

If you want only 50 lines starting from line number 100, use...
:100,150w! new_file.txt

... Link (0 comments) ... Comment


IP addresses from access log

generate a list of IP address along with the number of times each was encountered and sort

cat access_log | awk '{print $1}' | sort | uniq -c | sort -nr

... Link (0 comments) ... Comment


Backup a directory

!/bin/sh

tar czvf $1.$(date +%Y%m%d-%H%M%S).tgz $1
exit $?

The arc script accepts a single file or directory name as a parameter and creates a compressed archive file with the current date embedded into the resulting archive file's name.

... Link (0 comments) ... Comment


read .csv file

!/bin/sh

awk -F"," '{print $1,$2}' read1.txt | while read var1 var2
do
echo $var1 $var2
done

... Link (0 comments) ... Comment


findtable shell script

vi /bin/findtable

!bin/sh

mysql -e"select TABLE_SCHEMA, TABLE_NAME, ENGINE, TABLE_ROWS, CREATE_TIME FROM information_schema.TABLES where TABLE_NAME LIKE '%$1%';"

chmod 777 /bin/findtable

sh findtable test

... Link (0 comments) ... Comment


Unix cheatsheets

Cheat sheet act as a reference tool which provides cut and paste kind of commands to complete a specific task. I often recommend following set of best cheat sheets to students and IT professionals. It include Linux / UNIX command and shell scripting.

Read more: Top 10 Best Cheat Sheets and Tutorials for Linux / UNIX Commands

... Link (0 comments) ... Comment


compress and send

scp is the standard command to copy a folder or files. You can also compress the files before sending it as shown below. In this test I am using a folder with 4 files of 3.5 MB size. The time is reduced to 5 seconds from 40 seconds.

time scp /root/shantanu/* root@172.29.0.131:/root/

root@172.29.0.131's password:
iostat0111.log 100% 46KB 46.3KB/s 00:00
mystats.txt 100% 201KB 201.5KB/s 00:00
top0111.log 100% 3219KB 100.6KB/s 00:32
vmstat0111.log 100% 21KB 20.7KB/s 00:00

real 0m39.844s
user 0m0.053s
sys 0m0.021s

time tar zcf - shantanu | ssh 172.29.0.131 "cd /root/shantanu/; tar zpxvf -"

root@172.29.0.131's password:
shantanu/
shantanu/top0111.log
shantanu/mystats.txt
shantanu/vmstat0111.log
shantanu/iostat0111.log

real 0m5.326s
user 0m0.068s
sys 0m0.015s

If you type the full path to the folder /root/shantanu/ then a new folder in the destination folder will be created with the same path.

... Link (0 comments) ... Comment


Online for 6640 days
Last modified: 10/28/20 5:59 PM
Status
Youre not logged in ... Login
Menu
... Home
... Tags

Search
Calendar
October 2020
SunMonTueWedThuFriSat
123
45678910
11121314151617
18192021222324
25262728293031
April
Recent updates
important leafy vegetables 1. Amaranthus
caudatus: rajgira. 2. Amaranthus tricolor: Math.  (Chhoti Chulai- Hindi, Cheera-...
by shantanuo (4/12/20 2:01 PM)
program creek program creek
seems to be a good site for handy references of python...
by shantanuo (4/11/20 11:24 AM)
Standard out to a file
This code will change the standard out to a file...
by shantanuo (4/11/20 11:18 AM)
Create config file for AWS
command line tool While creating amazon config file in a...
by shantanuo (2/20/20 6:00 AM)
setting colors in pandas This
is how to set the colors in pandas mapper =...
by shantanuo (2/20/20 5:53 AM)
log mysql output tee output.txt
show global variables; show engine innodb status\G show full processlist;...
by shantanuo (2/19/20 10:33 AM)
access AWS API gateway using
python Amazon API gateway allows us to host server-less API's...
by shantanuo (2/16/20 9:41 AM)
Using boto In the bad
old days, the glacier class used to have different layers....
by shantanuo (2/15/20 10:28 AM)
backup mysql users  3
steps to install perconal utility... yum install perl-DBI perl-Data-Dumper perl-DBD-MySQL wget...
by shantanuo (2/13/20 1:49 PM)
Steps to be used for
generating AWS API gateway a) Method Execution - Get Method...
by shantanuo (2/13/20 1:30 PM)
apply colors to pandas Here
is how to change the color of negative values to...
by shantanuo (2/12/20 8:57 AM)
Holidays in India These are
the common holidays celebrated in India (Mumbai) during 2016 -...
by shantanuo (2/11/20 1:53 PM)
change log file size in
MySQL Here are the steps to be followed while changing...
by shantanuo (2/11/20 10:38 AM)
MySQL common error messages 1146
Table does not exist 1054 column does not exist 1062...
by shantanuo (2/11/20 10:13 AM)
ipython parallel demo First start
ipython in cluster mode ipcluster start -n 4 from IPython.parallel...
by shantanuo (2/9/20 9:02 AM)
djanog settings You may see
this message if you have DEBUG = True in your...
by shantanuo (2/9/20 4:07 AM)
clear tmp folder Here is
following commands to clear unwanted stuff from the /tmp partition...
by shantanuo (2/8/20 2:41 PM)
change your server time to
IST If you need to change your server clock to...
by shantanuo (2/8/20 2:39 PM)
Transfer root emails to another
email address If you have root access to the server...
by shantanuo (2/8/20 2:32 PM)
special strings in cron Instead
of the first five fields, you can use any one...
by shantanuo (2/8/20 2:30 PM)
LibreOffice version conflict I am
not able to install latest version of Libre office. I...
by shantanuo (1/29/20 9:15 AM)
while loop This is
a sample shell script while loop while read mydb do echo...
by shantanuo (1/26/20 12:24 PM)
compare mysql schema And here
is poor man's schema compare using good old diff command......
by shantanuo (1/26/20 11:49 AM)
Selecting from error log grep
"error" error_log |awk -F[ {'print $4'} \ | sort |...
by shantanuo (1/26/20 10:40 AM)
Rank mysql records using variables
SET @rank = 0, @prev_val = NULL; SELECT rank, correct...
by shantanuo (1/26/20 9:45 AM)

RSS feed

Made with Antville
Helma Object Publisher