How to cut specific characters from string or file name in Linux shell script..

Hello Guys, 

Today I am going to show you how we can cut or get particular string from a file name which is having special char (underscore) and extension of file name in Linux shell script. 

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Please refer below command which I have used.

ls -ltrh  | grep DBMS_XPLAN_OUTLINE_ > a.log

cat a.log | awk '{print $9}' > /tmp/_a.log

cat  /tmp/_a.log | sed 's/DBMS_XPLAN_OUTLINE_//' > /tmp/_a1.log

cat /tmp/_a1.log | sed "s/\.log$//" > /tmp/_a2.log

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Please refer output of above command steps by step.

 1.  [oracle@oracle11g newsql]$ ls -ltrh

total 80K

-rw-rw-r-- 1 oracle oracle 5.6K Mar 23 15:34 DBMS_XPLAN_OUTLINE_aykvshm7zsabd.log

-rw-rw-r-- 1 oracle oracle 3.8K Mar 23 15:34 DBMS_XPLAN_OUTLINE_53saa2zkr6wc3.log

-rw-rw-r-- 1 oracle oracle 4.4K Mar 23 15:34 DBMS_XPLAN_OUTLINE_08bqjmf8490s2.log

-rw-rw-r-- 1 oracle oracle 3.5K Mar 23 15:34 DBMS_XPLAN_OUTLINE_bsa0wjtftg3uw.log

-rw-rw-r-- 1 oracle oracle 3.8K Mar 23 15:34 DBMS_XPLAN_OUTLINE_bfujkg8dw1aax.log

-rw-rw-r-- 1 oracle oracle 3.9K Mar 23 15:34 DBMS_XPLAN_OUTLINE_0k8522rmdzg4k.log

-rw-rw-r-- 1 oracle oracle 5.4K Mar 23 15:34 DBMS_XPLAN_OUTLINE_cm5vu20fhtnq1.log

-rw-rw-r-- 1 oracle oracle 3.6K Mar 23 15:34 DBMS_XPLAN_OUTLINE_8hpppyj5kdn3y.log

-rw-rw-r-- 1 oracle oracle 3.8K Mar 23 15:34 DBMS_XPLAN_OUTLINE_g3wrkmxkxzhf2.log

-rw-rw-r-- 1 oracle oracle 3.6K Mar 23 15:34 DBMS_XPLAN_OUTLINE_459f3z9u4fb3u.log

-rw-rw-r-- 1 oracle oracle 3.9K Mar 23 15:34 DBMS_XPLAN_OUTLINE_3w4qs0tbpmxr6.log

-rw-rw-r-- 1 oracle oracle 4.3K Mar 23 15:34 DBMS_XPLAN_OUTLINE_6aq34nj2zb2n7.log

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2. [oracle@oracle11g newsql]$ ls -ltrh  | grep DBMS_XPLAN_OUTLINE_ > a.log

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3. [oracle@oracle11g newsql]$ cat a.log

-rw-rw-r-- 1 oracle oracle 5.6K Mar 23 15:34 DBMS_XPLAN_OUTLINE_aykvshm7zsabd.log

-rw-rw-r-- 1 oracle oracle 3.8K Mar 23 15:34 DBMS_XPLAN_OUTLINE_53saa2zkr6wc3.log

-rw-rw-r-- 1 oracle oracle 4.4K Mar 23 15:34 DBMS_XPLAN_OUTLINE_08bqjmf8490s2.log

-rw-rw-r-- 1 oracle oracle 3.5K Mar 23 15:34 DBMS_XPLAN_OUTLINE_bsa0wjtftg3uw.log

-rw-rw-r-- 1 oracle oracle 3.8K Mar 23 15:34 DBMS_XPLAN_OUTLINE_bfujkg8dw1aax.log

-rw-rw-r-- 1 oracle oracle 3.9K Mar 23 15:34 DBMS_XPLAN_OUTLINE_0k8522rmdzg4k.log

-rw-rw-r-- 1 oracle oracle 5.4K Mar 23 15:34 DBMS_XPLAN_OUTLINE_cm5vu20fhtnq1.log

-rw-rw-r-- 1 oracle oracle 3.6K Mar 23 15:34 DBMS_XPLAN_OUTLINE_8hpppyj5kdn3y.log

-rw-rw-r-- 1 oracle oracle 3.8K Mar 23 15:34 DBMS_XPLAN_OUTLINE_g3wrkmxkxzhf2.log

-rw-rw-r-- 1 oracle oracle 3.6K Mar 23 15:34 DBMS_XPLAN_OUTLINE_459f3z9u4fb3u.log

-rw-rw-r-- 1 oracle oracle 3.9K Mar 23 15:34 DBMS_XPLAN_OUTLINE_3w4qs0tbpmxr6.log

-rw-rw-r-- 1 oracle oracle 4.3K Mar 23 15:34 DBMS_XPLAN_OUTLINE_6aq34nj2zb2n7.log

-rw-rw-r-- 1 oracle oracle 4.1K Mar 23 15:34 DBMS_XPLAN_OUTLINE_0b84axbzj7g59.log

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4. [oracle@oracle11g newsql]$ cat a.log | awk '{print $9}' > /tmp/_a.log

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5. [oracle@oracle11g newsql]$ cat /tmp/_a.log

DBMS_XPLAN_OUTLINE_aykvshm7zsabd.log

DBMS_XPLAN_OUTLINE_53saa2zkr6wc3.log

DBMS_XPLAN_OUTLINE_08bqjmf8490s2.log

DBMS_XPLAN_OUTLINE_bsa0wjtftg3uw.log

DBMS_XPLAN_OUTLINE_bfujkg8dw1aax.log

DBMS_XPLAN_OUTLINE_0k8522rmdzg4k.log

DBMS_XPLAN_OUTLINE_cm5vu20fhtnq1.log

DBMS_XPLAN_OUTLINE_8hpppyj5kdn3y.log

DBMS_XPLAN_OUTLINE_g3wrkmxkxzhf2.log

DBMS_XPLAN_OUTLINE_459f3z9u4fb3u.log

DBMS_XPLAN_OUTLINE_3w4qs0tbpmxr6.log

DBMS_XPLAN_OUTLINE_6aq34nj2zb2n7.log

DBMS_XPLAN_OUTLINE_0b84axbzj7g59.log

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6. [oracle@oracle11g newsql]$ cat  /tmp/_a.log | sed 's/DBMS_XPLAN_OUTLINE_//' > /tmp/_a1.log

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[oracle@oracle11g newsql]$ cat /tmp/_a1.log

aykvshm7zsabd.log

53saa2zkr6wc3.log

08bqjmf8490s2.log

bsa0wjtftg3uw.log

bfujkg8dw1aax.log

0k8522rmdzg4k.log

cm5vu20fhtnq1.log

8hpppyj5kdn3y.log

g3wrkmxkxzhf2.log

459f3z9u4fb3u.log

3w4qs0tbpmxr6.log

6aq34nj2zb2n7.log

0b84axbzj7g59.log

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7. [oracle@oracle11g newsql]$ cat /tmp/_a1.log | sed "s/\.log$//" > /tmp/_a2.log

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8. [oracle@oracle11g newsql]$ cat /tmp/_a2.log

aykvshm7zsabd

53saa2zkr6wc3

08bqjmf8490s2

bsa0wjtftg3uw

bfujkg8dw1aax

0k8522rmdzg4k

cm5vu20fhtnq1

8hpppyj5kdn3y

g3wrkmxkxzhf2

459f3z9u4fb3u

3w4qs0tbpmxr6

6aq34nj2zb2n7

0b84axbzj7g59

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