更新適當的值的特定條目在給定文件

讓說，我有一個文件名hello.conf，

/agent/process="starthelloJava",start="/opt/starthello.sh",start_dir="/opt/hello",start_args="" 
/agent/process="stophelloJava",stop="/opt/stophello.sh",stop_dir=/opt/hello",stop_args="",stop_timeout="30"

更新starthelloJava與

start_args="-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/var/"

輸出

/agent/process="starthelloJava",start="/opt/starthello.sh",start_dir="/opt/hello",start_args="-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/var/"

空進程的start_argsstarthelloJava

/agent/process="starthelloJava",start="/opt/starthello.sh",start_dir="/opt/hello",start_args="" 
/agent/process="stophelloJava",stop="/opt/stophello.sh",stop_dir=/opt/hello",stop_args="",stop_timeout="30"

我做的方法是大步就是我重寫整個文件，根據輸入。

這是我apprach效率不高

cp hello.conf hello.conf_bak 
remove entry first 
cat /opt/CSCObac/agent/conf/agent.conf_bak | grep -v /opt/starthello.sh > hello.conf 
echo "/agent/process=\"starthelloJava\",start=\"/opt/starthello.sh\",start_dir=\"/opt/hello\",start_args=\"-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/var/\" >> hello.conf

來源

2013-02-05 anish

我沒有看到任何替代，除非你能保證長度將永遠同意（墨菲_將確保他們不是在你已經忘記的時候）。 Perl有「inplace munging of files」，檢查'perlrun（1）'，我相信GNU'sed（1）'也會（它們會在末尾寫入臨時文件並重命名）。 – vonbrand

@ patter只有固定/ agent/process =「」，start =「」，start_dir =「」該值僅固定爲start和start_dir – anish

set -- '-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/var/' 
sed -i -r "s!(.*starthelloJava.*=).*!\1\"$1\"!" hello.conf

或空值

set -- '' 
sed -i -r "s!(.*starthelloJava.*=).*!\1\"$1\"!" hello.conf

來源

2013-02-05 17:20:58

更新適當的值的特定條目在給定文件

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