Thanks to antville.org
shell script example

An example of shell script.
This will print numbers 0 to 500 in one line.

!/bin/bash

Z=0
LIMIT=500
while [ "$Z" -lt "$LIMIT" ]

do
echo -n "$Z... "
Z=$( expr $Z + 1 )
done
echo
exit 0


ping the address received from positional parameter

!/bin/bash

if [ $# -eq 0 ]
then
SITE="google.com"
else
SITE="$1"
fi

ping -c 2 $SITE > /dev/null
if [ $? != 0 ]
then
echo $(date +%F) ... Network Failure!
fi


Here is the script that will loop two thousand times and print the statement on the screen.

!/bin/sh

MAX=2000
i=1
echo " truncate table t1; "

while [ $i -le $MAX ]
do
echo " insert into t1(f1) values($i); "
i=expr $i + 1
done

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


Match Operator in AWK

The match operator is the tilde “~” which will match an expression in a record or field. In this example awk is used to search for a field, number 7, that matches “nologin”.

awk -F: '$7 ~ /nologin/' /etc/passwd
bin:x:1:1:bin:/bin:/sbin/nologin
daemon:x:2:2:daemon:/sbin:/sbin/nologin
adm:x:3:4:adm:/var/adm:/sbin/nologin

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


Copy table

!/bin/sh

for i in find /var/lib/mysql/test/ -name "Table1.*"
do
cp $i dirname $i'/test'basename $i
done

duplicate a table Table1 by coping the files if it is a MyISAM table.

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


Inernal File Separator

The safe way to change IFS in a 'while read' loop is:

while IFS=| read a b c
do
: whatever
done

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


valid date

validdate.sh script will look like this...

!/bin/sh

userdate=$1
date -d $userdate &> /dev/null
if [ $? -ne 0 ] ; then
echo You entered an invalid date, $userdate
else
echo The date $userdate is valid
fi

sh validdate.sh 2009-33-44

You entered an invalid date, 2009-33-44

... 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


better code

test -s /var/log/mailme.txt
if [[ $? -eq 0 ]] ; then
The above 2 lines can be written in one line as shown below:

if [[ -z /var/log/mailme.txt ]]; then

... 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


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