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I need to add something to a file, plzz help

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Top Forums Shell Programming and Scripting I need to add something to a file, plzz help
# 1  
Old 07-31-2008
I need to add something to a file, plzz help
The first step for you to create the script to change “JAVA_OPTS” variable definition as follows:

Original line:
JAVA_OPTS="-Dname=$JAVA_NAME -Xmx$JVM_MAX -DAGENT_HOME=$RT_HOME -DINSTALL_DIR=$RT_HOME -Djavax.net.ssl.keyStore=$RT_HOME/conf/client.keystore -Djavax.net.ssl.keyStoreType=jks -Djavax.net.ssl.keyStorePassword -Dhttps.cipherSuites=SSL_RSA_WITH_RC4_128_SHA $DEBUG_OPTS -COMM_NOT_DEPLOY=native_lib $AGENT_CONFIG_PROPS"

Change to:
JAVA_OPTS="-client -Dname=$JAVA_NAME -Xmx$JVM_MAX -DAGENT_HOME=$RT_HOME -DINSTALL_DIR=$RT_HOME -Djavax.net.ssl.keyStore=$RT_HOME/conf/client.keystore -Djavax.net.ssl.keyStoreType=jks -Djavax.net.ssl.keyStorePassword -Dhttps.cipherSuites=SSL_RSA_WITH_RC4_128_SHA $DEBUG_OPTS -COMM_NOT_DEPLOY=native_lib $AGENT_CONFIG_PROPS




IF THE "-client" option is already in, do nothing and print out the message " no change is needed" or add "-client" to the orignal script.


please reply me
thanks

# 2  
Old 07-31-2008
Sounds like homework...

A possible solution :
Code:
> cat asirohi.sh
InputFile='asirohi.dat'
JavaOpts='JAVA_OPTS'

if grep -q "^$JavaOpts=" $InputFile
then
   if grep -q "^$JavaOpts=\"-client " $InputFile
   then
      echo "No change neeeded !"
   else
      sed "s/^\($JavaOpts=\"\)/\1-client /" $InputFile > ${InputFile}.tmp && \
      mv ${InputFile}     ${InputFile}.old                                && \
      mv ${InputFile}.tmp ${InputFile}
   fi
else
   echo "File doesn't contain $JavaOpts variable definition !"
fi
> cat asirohi.dat
ROOT=/
JAVA_OPTS="-Dname=$JAVA_NAME -Xmx$JVM_MAX -DAGENT_HOME=$RT_HOME -DINSTALL_DIR=$RT_HOME -Djavax.net.ssl.keyStore=$RT_HOME/conf/client
.keystore -Djavax.net.ssl.keyStoreType=jks -Djavax.net.ssl.keyStorePassword -Dhttps.cipherSuites=SSL_RSA_WITH_RC4_128_SHA $DEBUG_OPT
S -COMM_NOT_DEPLOY=native_lib $AGENT_CONFIG_PROPS"
TMP=/tmp
> asirohi.sh
> cat asirohi.dat
ROOT=/
JAVA_OPTS="-client -Dname=$JAVA_NAME -Xmx$JVM_MAX -DAGENT_HOME=$RT_HOME -DINSTALL_DIR=$RT_HOME -Djavax.net.ssl.keyStore=$RT_HOME/con
f/client.keystore -Djavax.net.ssl.keyStoreType=jks -Djavax.net.ssl.keyStorePassword -Dhttps.cipherSuites=SSL_RSA_WITH_RC4_128_SHA $D
EBUG_OPTS -COMM_NOT_DEPLOY=native_lib $AGENT_CONFIG_PROPS"
TMP=/tmp
> asirohi.sh
No change neeeded !
> cat asirohi.dat
ROOT=/
JAVA_OPTS="-client -Dname=$JAVA_NAME -Xmx$JVM_MAX -DAGENT_HOME=$RT_HOME -DINSTALL_DIR=$RT_HOME -Djavax.net.ssl.keyStore=$RT_HOME/con
f/client.keystore -Djavax.net.ssl.keyStoreType=jks -Djavax.net.ssl.keyStorePassword -Dhttps.cipherSuites=SSL_RSA_WITH_RC4_128_SHA $D
EBUG_OPTS -COMM_NOT_DEPLOY=native_lib $AGENT_CONFIG_PROPS"
TMP=/tmp
~/Forums>

Jean-Pierre.
# 3  
Old 07-31-2008
how does this work, is there not a simple way to parse and add "-client" if its not present.
# 4  
Old 07-31-2008
Use sed:
Code:
sed 's/"-Dname/"-Client -Dname/g' file

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