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# 1  
Old 03-28-2012
Help with SED
Anyway, i'm writing a shell script and i read in input with the following:
read $foo


i now want to use this variable in my sed string replacement like so:
Code:
sed -i 's/replaceme/$foo' myfile.txt


What i'm getting instead is the literal substitution not what $foo actually equals. Instead i want it to be the input of the user:


-Sid
Last edited by Franklin52; 03-29-2012 at 07:06 AM.. Reason: Please use code tags for code and data samples, thank you
# 2  
Old 03-28-2012
Quote:
Originally Posted by Siddheshk
Anyway, i'm writing a shell script and i read in input with the following:
read $foo
That's probably not doing what you want. It will not read input into the variable named foo.

Try
Code:
read foo


Quote:
i now want to use this variable in my sed string replacement like so:
sed -i 's/replaceme/$foo' myfile.txt


What i'm getting instead is the literal substitution not what $foo actually equals. Instead i want it to be the input of the user:


-Sid
Variables never expand inside single quotes. Try double quotes.
Code:
$ var=asdf
$ echo '$var'
$var

$ echo "$var"
asdf

$

# 3  
Old 03-28-2012
may be i did not explain well..

here is the live example..

Code:
read -p "Enter your name of rocommunity string you wish to set and press [ENTER]: "  string

sed -i '/rocommunity/s/public/$string/' /opt/adapter/Adapter/snmp/conf/snmpd.conf

here the value of string is "spider..Now do i use to replace with sed command as mentioned above.

---------- Post updated at 12:53 AM ---------- Previous update was at 12:31 AM ----------

Corona688, any suggestion please.

-Siddhesh
# 4  
Old 03-28-2012
You're still putting the variable in single ' ' quotes.

Variables never expand in single ' ' quotes.

Put it in double " " quotes.
# 5  
Old 03-28-2012
Well i tried the same.

the script runs succesfully but the value is not replaced to i pass on when prompted for.

Code:
[root@Mediaspire siddhesh]# ./rommonity_new.sh
`/opt/adapter/Adapter/snmp/conf/snmpd.conf' -> `/var/tmp/snmpd.conf_27Mar2012'
`/opt/adapter/ManagementTool/conf/MTInternalConfig.properties' -> `/var/tmp/MTInternalConfig.properties_27Mar2012'
Hello, You are about to change the rocommunity string in  /opt/adapter/Adapter/snmp/conf/snmpd.conf.
Enter your name of rocommunitry string you wish to set andpress [ENTER]:data

It replace the one specified in sed command but not the value for it.
Please advice.

-Siddhesh
# 6  
Old 03-28-2012
Show the input you have and the output you want. Your sed expression may not be right -- without seeing the data it's supposed to match and change, I really can't tell.

Also show the current contents of your script.

I really don't reccomend using things like sed -i without backing up the originals first. Destroying your original configuration files by accident would be a big problem.
# 7  
Old 03-28-2012
Code:
#Defining Variable
#------------------------
IP_LIST=/root/IP_LIST
ADAPTER_HOME=/opt/adapter
SNMP=/opt/adapter/Adapter/snmp/conf/snmpd.conf
BACKUP_DIR=/var/tmp
DATE=`date +%Y%m%d%H%M%S`
LOG=/root/community_logs
TMP=/tmp/value

#Backing Up Orginal Files
#-------------------------
echo "Backing up the original configuration file to $BACKUP_DIR" > $LOG.$DATE
cp -pv $ADAPTER_HOME/Adapter/snmp/conf/snmpd.conf $BACKUP_DIR/snmpd.conf_$(date +%d%b%Y)
cp -pv $ADAPTER_HOME/ManagementTool/conf/MTInternalConfig.properties $BACKUP_DIR/MTInternalConfig.properties_$(date +%d%b%Y)
echo "Orignal Log file back-up done succesfully" >$LOG.$DATE

echo "Hello, You are about to change the rocommunity string in  "/opt/adapter/Adapter/snmp/conf/snmpd.conf"."


read -p "Enter your name of rocommunitry string you wish to set andpress [ENTER]:" string

sed -i "/rocommunity/s/public/$string/" /opt/adapter/Adapter/snmp/conf/snmpd.conf

exit 0

I want the value which i enter to be replace in /opt/adapter/Adapter/snmp/conf/snmpd.conf file for rocommunity variable.

-Siddhesh
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