Built-in string functions in the awk language in AIX

Built-in string function [plain] www.2cto in The awk language in AIX. built-in string functions & mdash; & mdash; & mdash
The built-in string function [plain] www.2cto.com in The awk language in AIX replaces r gsub (r, s) with s in $0, t) replace r index (s, t) with s in the entire t to return the length (s) at the first position of the string t in s to return the length of s. match (s, r) test if s contains the string split (s, a, fs) matching r. return fs to split s into series a sprint (fmt, exp) and return the exp sub (r, s) replace s substr (s, p) with the leftmost longest substring in $0 to return substr (s, p, n) of the suffix starting from p in string s) returns the suffix of n starting from p in string s ------------------------- ------------------------------------- 1. the gsub function replaces 4842 of rows containing 4842 with 4899: awk 'gsub (/4842/, 4899) {print $0} 'grade.txt J. troll 07/99 4899 Brown-3 12 26 26 awk '{if ($3 ~ /4842/) print $0} 'grade.txt [or awk' $0 ~ /4842/'grade.txt] J. troll 07/99 4842 Brown-3 12 26 26 2. the index function finds the location where ny first appeared: awk 'end {print index ("Bunny", "ny ")} 'grade.txt 4: Locate the first occurrence location of ny in the first domain containing Bunny, and print this line: awk '$1 ~ /Bunny/{print index ($1, "ny") ":" $0} 'grade.txt 6: P. bunny 02/99 48 Yello 12 35 28 3. length function awk 'if ($1 ~ /Tran/) | (length ($1)> 7) {print $0} 'grade.txt error: awk: syntax error at line 1 of program <if ($1 ~ /Tran/) | (...> context is >>> if <($1 ~ /Tran/) | (length ($1)> 7) {print $0} awk: bailing out at line 1 of program <if ($1 ~ /Tran/) | (...> cause of error: all actions must be included in. Correct: awk '{if ($1 ~ /Tran/) | (length ($1)> 7) {print $0} 'grade.txt M. tansley 05/99 48311 Green 8 40 44 L. tansley 05/99 4712 Brown-2 12 30 28 4. match function awk 'In in {print match ("abcd",/A/)} '0 awk' BEGIN {print match ("abcd",/c /)} '3 awk' $1 = "J. lulu "{print match ($1," u ")} 'grade.txt 4 5. split function awk 'In in {print split ("123 #456 #789", myarray, "#")} '3 6. sub function awk 'if ($1 ~ /Troll/) {print $0} 'grade.txt if must be placed in {}; otherwise, awk: Syntax error at line 1 of program <if ($1 ~ /Troll/) {prin...> context is >>> if <($1 ~ /Troll/) {print $0} awk: bailing out at line 1 of program <if ($1 ~ /Troll/) {prin...> awk '{if ($1 ~ /Troll/) {print $0} 'grade.txt J. troll 07/99 4842 Brown-3 12 26 26 7. substr function awk '$1 = "L. tansley "{print substr ($1, 1, 5)} 'grade.txt L. tan does not have the third parameter awk '$1 = "L. tansley "{print substr ($1, 1)} 'grade.txt L. the three parameters in Tansley are greater than the domain length awk '$1 = "L. tansley "{print substr ($100,)} 'grade.txt L. tansley specifies the length of awk '$1 = "L. tansley "{print substr ($1, 1, length ($1)-1)} 'grade.txt L. the starting position of tanlupus is 0 awk '$1 = "L. tansley "{prin T substr ($1, 0, length ($1)-1)} 'grade.txt L. intercept the entire line awk '$1 = "L. tansley "{print substr ($0, 1, 15)} 'grade.txt L. tansley 05/9 prints the captured data and the original data awk '$1 = "L. tansley "{print substr ($0, 15)} END {print $0} 'grade.txt L. tansley 05/9 L. tansley 05/99 4712 Brown-2 12 30 28 connect the intercepted string to an awk '$1 = "L. tansley "{print substr ($0, 1, 15)" ___ 3 blanks "} 'grade.txt L. tansley 05/9 ___ 3 blanks get name awk '{print substr ($ )} 'Grade.txt Tansley Lulu Bunny Troll Tansley 8. input the echo "_ yeeXun" | awk '{print length ($0)} string to awk from shell )} '7 STR = "grade.txt" echo $ STR | awk' {print substr ($ STR,)} 'awk: illegal field $ () input record number 1, file-source line 1 of program <{print substr ($ STR, 1...> cause of error: awk does not know $ STR. the data passed by pipeline commands is considered as $0. Therefore, replace $ STR with $0: echo $ STR | awk '{print substr ($, 5)} 'grade truncation suffix echo $ STR | awk' {print s Ubstr ($)} 'txt echo $ STR | awk' {print substr ($0, match ($0 ,/\. /) + 1)} 'txt: ls-l total 28-rw-r -- 1 xxxx group 0 Nov 19 cat-rw-r -- 1 xxxx group 28 Nov 14 cat_file.txt drwxr-xr-x 2 xxxx group 512 Nov 21 c_src-rw-r -- 1 xxxx group 356 Nov 16 data. f-rw-r -- 1 xxxx group 284 Nov 19 delete_me_and_die-rwxr -- r -- 1 xxxx group 61 Nov 8 first2 -Rw-r -- 1 xxxx group 235 Nov 19 grade.txt-rwxr -- r -- 1 xxxx group 354 Nov 17 info.txt-rwxr ----- 1 xxxx group 23 Nov 7 myfile drwxr -xr-x 2 xxxx group 512 Nov 21 SQL _src-rwxr -- r -- 1 xxxx group 225 Nov 15 test. bak-rwxr -- r -- 1 xxxx group 225 Nov 15 test. SQL-rw-r -- 1 xxxx group 1998 Nov 15 who. out-rw-r -- 1 xxxx group 229 Nov 19 14:44 wow ls-l | Awk '{print substr ($9, match ($9 ,/\. /) + 1)} 'cat txt c_src f delete_me_and_die first2 txt myfile SQL _src bak SQL out wow find the file with the suffix ls-l | awk '{if (match ($9, /\. /)> 0) {print $9} 'cat_file.txt data. f grade.txt info.txt test. bak test. SQL who. out and then intercept the suffix: ls-l | awk '{if (match ($9 ,/\. /)> 0) {print substr ($9, match ($9 ,/\. /) + 1)} 'txt f txt bak SQL out. separate the file name from the suffix: ls-l | awk '{if (match ($9 ,/\./ )> 0) {print $9 "#" substr ($9, match ($9 ,/\. /) + 1)} 'cat_file.txt # txt data. f # f grade.txt # txt info.txt # txt test. bak # bak test. SQL # SQL who. out # out use ">" to write data to the file and directly overwrite the data; ">", additional. -- The end --