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st='abcd'
1.×Ö·û´®³¤¶È
expr length $st »òÕß ${#st}
2.È¡×Ö·û´®µÄsubstring
expr substr "$var" startpos length »òÕß ${var:m} ${var:m:len}
${var:m}ÖеÄmµÄȡֵ´Ó0µ½${#var}-1£¬Æä·µ»ØµÄÊÇ´ÓµÚm¸ö×Ö·ûµ½×îºóµÄ²¿·Ö£»ÀýÈçecho ${st:1}µÄ½á¹ûÊÇ'bcd'
expr substr "$var" startpos length ÖеÄstartposȡֵ·¶Î§ÊÇ1µ½${#var}£»
3.²éÕÒ×Ó´®µÄλÖÃ
expr index "$str" "$substr" ·µ»ØÖµÎª0£¬±íʾûÓÐÕÒµ½£»
4.Æ¥Åä×Ö´®µÄ³¤¶È
 expr match "$str" '$substr' eg:expr match $st 'abc' ·µ»ØÖµÎª3
 expr "$str" : '$substr'
 ×¢Ò⣺$substring ¿ÉÒÔÊÇÒ»¸öÕýÔò±í´ïʽ
5.×Ö·û´®µÄÌæ»»
${var/old/new}ÓÃnewÌæ»»${var}ÖеÚÒ»´Î³öÏÖµÄold;eg: s='abc123abc' echo ${s/abc/23}·µ»ØÖµÎª'23123abc'
${var//old/new}ÓÃnewÌæ»»${var}ÖеÚÒ»´Î³öÏÖµÄold;eg: s='abc123abc' echo ${s/abc/23}·µ»ØÖµÎª'2312323'
${var/#old/new} Èç¹û$substring Æ¥Åä$varµÄ¿ªÍ·²¿·Ö,ÄÇô¾ÍÓÃ$newÀ´Ìæ»»$old£»
${var/%old/new} Èç¹û$substring Æ¥Åä$varµÄ½áβ²¿·Ö,ÄÇô¾ÍÓÃ$newÀ´Ìæ»»$old£»
 
6.×Ó´®Çå³ý
${string#substring}  ´Ó$string µÄ×ó±ß½ØµôµÚÒ»¸öÆ¥ÅäµÄ$substring 
${string##substring} ´Ó$string µÄ×ó±ß½Øµô×îºóÒ»¸öÆ¥ÅäµÄ$substring
${string%substring}  ´Ó$string µÄÓұ߽صôµÚÒ»¸öÆ¥ÅäµÄ$substring
${string%%substring}  ´Ó$string µÄÓұ߽صô×îºóÒ»¸öÆ¥ÅäµÄ$substring
7.×Ö·û´®´óСдת»»
trÃüÁî
echo $st | tr '[a-z]*' '[A-Z]*' Сдת´óд£»
echo $st | tr  '[A-Z]*' '[a-z]*' ´óдתСд£»


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