引用自：三十分钟学会AWK
awk
pattern scanning and text processing language
工作流程
st=>start: Excute AWK commands from BEGIN block
e=>end: Excute AWK commands from END block
read=>operation: Read a line from input stream
execute=>operation: Execute AWK commands on a line
cond=>condition: Is it End of File
st->read->execute->cond
cond(yes)->e
cond(no,right)->read
程序框架 注意:BEGIN/End是awk的关键字,必须大写
BEGIN {awk-commands}
/pattern/ {awk-commands}
END {awk-commands}
awk example
将最后一列的日期型字符串转为时间戳
#!/bin/bash
awk '{
for (i=1;i<NF;i++){
printf $i "\t";
}
cmd=("date +%Y-%m-%d-%H -d @" $NF);
system(cmd);
printf("\n");
}' $1;