if else:

awk '{if ($5>22) print $5  " bad ";else print $5 " ok"}' aa.txt

awk '{if ($5>100) {count++;print $5} else {count--; print $1}}' aa.txt

if 多重判断

df -h|awk '{if ($5>70) {count++;print ""} else if ($5>100) {count++;print "cc"} else { print "cc"}}'

df -h|grep -P "/$"|sed 's/%//'|awk '{if ($4>90) {count++;print "Error"} else if ($4>70) {count++;print "Warning"} else { print "Ok"}}'

将外部变量传入到 awk 中

将外部变量传入到awk + if 多重判断

SITE=$1

df -h|grep -P "/$"|sed 's/%//'|awk -v SITE=$SITE '{if ($4>90) {count++;printf SITE;print "Error"} else if ($4>70) {printf SITE;print

" Warning "} else { printf SITE;print " Ok "}}'

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