AIX下AWK语言的操作符
awk操作符—————————————————————————————————————————————= += *= / = %= ^ =赋值操作符? 条件表达操作符|| && !并，与，非< <= == != >>关系操作符+ - * / % ^算术操作符+ + --前缀和后缀——————————————————————————————————————————————1.设置输入域到域变量名awk '{name=$1;color=$4; if(color ~/Yello/)print name" " is color "color}' grade.txtP.Bunny is color Yello2.赋值比较，通常在BEGIN部分赋值a.在BEGIN中给变量名赋值awk 'BEGIN {BASELINE="27 "} {if($6<BASELINE) print $0}' grade.txtJ.Lulu 06/99 48317 green 9 24 26J.Troll 07/99 4842 Brown-3 12 26 26b.在关系操作中使用实际数值awk '{if($6 < 27) print $0}' grade.txtJ.Lulu 06/99 48317 green 9 24 26J.Troll 07/99 4842 Brown-3 12 26 263.修改数值域取值awk '{if($1=="M.Tansley") $5=$6-1; print $1, $6, $5, $7}' grade.txtM.Tansley 40 39 44J.Lulu 24 9 26P.Bunny 35 12 28J.Troll 26 12 26L.Tansley 30 12 284.修改文本域awk '{if($1=="J.Troll") ($1="J.Troll.L");print $1}' grade.txtM.TansleyJ.LuluP.BunnyJ.Troll.LL.Tansley5.只显示修改记录awk '{if( $1 == "J.Troll" ) {$1="J.Troll.L"; print $1}' grade.txtawk: Syntax error at line 1 of program << {if( $1 == "J.Troll" ... >> context is {if( $1 == "J.Troll" ) {$1="J.Troll.L"; print >>> $1} <<< 1 extra {awk: illegal statement at line 1 of program << {if( $1 == "J.Troll" ... >>错误原因：少了一个“}”结束awk '{if( $1 == "J.Troll" ) {$1="J.Troll.L"; print $1}}' grade.txtJ.Troll.L6.创建新的域awk 'BEGIN{ print "Name\t Difference"} {if($6 < $7) {$8=$7-$6; print $1,$8}}' grade.txtName DifferenceM.Tansley 4J.Lulu 27.统计数据awk '(tot += $6); END{print "Club student total points:" tot}' grade.txtM.Tansley 05/99 48311 Green 8 40 44J.Lulu 06/99 48317 green 9 24 26P.Bunny 02/99 48 Yello 12 35 28J.Troll 07/99 4842 Brown-3 12 26 26L.Tansley 05/99 4712 Brown-2 12 30 28Club student total points:1558.文件长度相加ls -l | awk ' /^[^d]/ {print $9"\t"$5} {tot += $5}END {print "total KB:"tot}'cat 0cat_file.txt 28data.f 356delete_me_and_die 284first2 61grade.txt 235info.txt 354myfile 23test.bak 225test.sql 225who.out 1998wow 229total KB:4018查看当前目录下的所有文件：ls -ltotal 24-rw-r--r-- 1 xxxx group 0 Nov 19 10:12 cat-rw-r--r-- 1 xxxx group 28 Nov 14 20:32 cat_file.txt-rw-r--r-- 1 xxxx group 356 Nov 16 19:50 data.f-rw-r--r-- 1 xxxx group 284 Nov 19 10:36 delete_me_and_die-rwxr--r-- 1 xxxx group 61 Nov 8 09:15 first2-rw-r--r-- 1 xxxx group 235 Nov 19 10:44 grade.txt-rwxr--r-- 1 xxxx group 354 Nov 17 11:05 info.txt-rwxr----- 1 xxxx group 23 Nov 7 19:12 myfile-rwxr--r-- 1 xxxx group 225 Nov 15 18:08 test.bak-rwxr--r-- 1 xxxx group 225 Nov 15 14:12 test.sql-rw-r--r-- 1 xxxx group 1998 Nov 15 14:15 who.out-rw-r--r-- 1 xxxx group 229 Nov 19 14:44 wow--the end--