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Contents of the file :
PS1="$(hostname):${LOGNAME}:${PWD} ${PROMPT} "
PS1="${FGOLD}$(hostname):${LOGNAME}:${PWD} ${PROMPT} ${NORMAL}"
PS1=abd
PS1="$(hostname):$LOGNAME:$PWD $PROMPT "
export PS1 LANG
Lines I want to change :
PS1="$(hostname):${LOGNAME}:${PWD} ${PROMPT} "
replacement line :
PS1="${FGOLD}$(hostname):${LOGNAME}:${PWD} ${PROMPT} ${NORMAL}"
Answer
You could use sed:
sed 's/^PS1="$(hostname).*${PROMPT}.*/PS1="${FGOLD}$(hostname):${LOGNAME}:${PWD} ${PROMPT} ${NORMAL}"/'
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