bash鐗规畩瀛楃-2
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鏍囩锛?a href='http://www.mamicode.com/so/1/%e5%ad%97%e6%af%8d' title='瀛楁瘝'>瀛楁瘝
chm 浠よ keyword power tor The 澶囦唤鏂囦欢 鍒嗘瀽 ------------鎭㈠鍐呭寮€濮?-----------
tips:
[],{}浣跨敤鏃跺墠鍚庤绌烘牸 [ asb=123 ]
1.灏忔嫭鍙凤紙( )锛?/strong>
杩愯浠ｇ爜锛?/p>
$ bash test20.sh
a = 123鍦ㄥ渾鎷彿涓?a 鍙橀噺锛屾洿鍍忔槸涓€涓眬閮ㄥ彉閲忋€?/p>
2.澶ф嫭鍙凤紙{ }锛?/span>
$ vim test22.sh
杈撳叆浠ｇ爜锛?/p>
#!/bin/bash
if [ ! -w 鈥榯.txt鈥?];
then
touch t.txt
fi
echo 鈥榯est text鈥?>> t.txt
cp t.{txt,back}杩愯浠ｇ爜锛?/p>
$ bash test22.sh鏌ョ湅杩愯缁撴灉锛?/p>
$ ls
$ cat t.txt
$ cat t.back娉ㄦ剰锛?鍦ㄥぇ鎷彿涓紝涓嶅厑璁告湁绌虹櫧锛岄櫎闈炶繖涓┖鐧借寮曠敤鎴栬浆涔夈€?/p>
$ vim test23.sh
杈撳叆浠ｇ爜锛?/p>
#!/bin/bash
a=123
{ a=321; }
echo "a = $a"杩愯浠ｇ爜锛?/p>
$ bash test23.sh
a = 321鍙橀噺 a 鐨勫€艰鏇存敼浜嗐€?/p>
3.涓嫭鍙凤紙[ ]锛?/strong>
1)鏉′欢娴嬭瘯
鏉′欢娴嬭瘯琛ㄨ揪寮忔斁鍦╗ ]涓€備笅鍒楃粌涔犱腑鐨?lt (less than)琛ㄧず灏忎簬鍙枫€?/p>
鍙屼腑鎷彿锛圼[ ]]锛変篃鐢ㄤ綔鏉′欢娴嬭瘯锛堝垽鏂級
2)鏁扮粍鍏冪礌
鍦ㄤ竴涓猘rray缁撴瀯鐨勪笂涓嬫枃涓紝涓嫭鍙风敤鏉ュ紩鐢ㄦ暟缁勪腑姣忎釜鍏冪礌鐨勭紪鍙枫€?/p>
4.灏栨嫭鍙凤紙< 鍜?>锛?/strong>
5.绔栫嚎锛坾锛?/strong>
绠￠亾
鍒嗘瀽鍓嶈竟鍛戒护鐨勮緭鍑猴紝骞跺皢杈撳嚭浣滀负鍚庤竟鍛戒护鐨勮緭鍏ャ€傝繖鏄竴绉嶄骇鐢熷懡浠ら摼鐨勫ソ鏂规硶銆?/p>
$ vim test26.sh杈撳叆浠ｇ爜锛?/p>
#!/bin/bash
tr 鈥榓-z鈥?鈥楢-Z鈥?exit 0鐜板湪璁╂垜浠緭閫乴s -l鐨勮緭鍑哄埌涓€涓剼鏈腑锛?/p>
$ chmod 755 test26.sh
$ ls -l | ./test26.sh杈撳嚭鐨勫唴瀹瑰潎鍙樹负浜嗗ぇ鍐欏瓧姣嶃€?/p>
6.鐮存姌鍙凤紙-锛?/strong>
1)閫夐」锛屽墠缂€
鍦ㄦ墍鏈夌殑鍛戒护鍐呭鏋滄兂浣跨敤閫夐」鍙傛暟鐨勮瘽,鍓嶈竟閮借鍔犱笂“-”銆?/p>
if [ "$a" -eq "$b" ]
2)鐢ㄤ簬閲嶅畾鍚憇tdin鎴杝tdout
涓嬮潰鑴氭湰鐢ㄤ簬澶囦唤鏈€鍚?4灏忔椂褰撳墠鐩綍涓嬫墍鏈変慨鏀圭殑鏂囦欢.
$ vim test28.sh杈撳叆浠ｇ爜锛?/p>
#!/bin/bash
BACKUPFILE=backup-$(date +%m-%d-%Y)
# 鍦ㄥ浠芥枃浠朵腑宓屽叆鏃堕棿.
archive=${1:-$BACKUPFILE}
# 濡傛灉鍦ㄥ懡浠よ涓病鏈夋寚瀹氬浠芥枃浠剁殑鏂囦欢鍚?
# 閭ｄ箞灏嗛粯璁や娇鐢?backup-MM-DD-YYYY.tar.gz".
tar cvf - `find . -mtime -1 -type f -print` > $archive.tar
gzip $archive.tar
echo "Directory $PWD backed up in archive file "$archive.tar.gz"."
exit 0杩愯浠ｇ爜锛?/p>
$ bash test28.sh
$ ls------------鎭㈠鍐呭缁撴潫------------
$ vim test26.sh#!/bin/bash
tr 鈥榓-z鈥?鈥楢-Z鈥?exit 0$ chmod 755 test26.sh
$ ls -l | ./test26.sh$ vim test28.sh#!/bin/bash
BACKUPFILE=backup-$(date +%m-%d-%Y)
# 鍦ㄥ浠芥枃浠朵腑宓屽叆鏃堕棿.
archive=${1:-$BACKUPFILE}
# 濡傛灉鍦ㄥ懡浠よ涓病鏈夋寚瀹氬浠芥枃浠剁殑鏂囦欢鍚?
# 閭ｄ箞灏嗛粯璁や娇鐢?backup-MM-DD-YYYY.tar.gz".
tar cvf - `find . -mtime -1 -type f -print` > $archive.tar
gzip $archive.tar
echo "Directory $PWD backed up in archive file "$archive.tar.gz"."
exit 0$ bash test28.sh
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