Ask sed to ignore all special characters [duplicate]

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What characters do I need to escape when using sed in a sh script?

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I use the following code to delete a line :

sed -i "0,/$DELETE_THIS/{/$DELETE_THIS/d;}" file.txt

But this code fails if the variable DELETE_THIS contains special characters, like ., /, * and so on...

Is there a way to tell sed to ignore all special characters and use them as basic text ?

edited Dec 5 at 12:02

Jeff Schaller

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asked Dec 5 at 11:38

bob dylan

4821615

marked as duplicate by Jeff Schaller, don_crissti, thrig, roaima, Stephen Harris Dec 5 at 23:08

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

1

You would have to escape any special characters in your query expression. Related: What characters do I need to escape when using sed in a sh script?
– Kusalananda
Dec 5 at 11:49

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up vote
1
down vote

favorite

This question already has an answer here:

What characters do I need to escape when using sed in a sh script?

3 answers

I use the following code to delete a line :

sed -i "0,/$DELETE_THIS/{/$DELETE_THIS/d;}" file.txt

But this code fails if the variable DELETE_THIS contains special characters, like ., /, * and so on...

Is there a way to tell sed to ignore all special characters and use them as basic text ?

edited Dec 5 at 12:02

Jeff Schaller

37.9k1053123

asked Dec 5 at 11:38

bob dylan

4821615

marked as duplicate by Jeff Schaller, don_crissti, thrig, roaima, Stephen Harris Dec 5 at 23:08

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

1

You would have to escape any special characters in your query expression. Related: What characters do I need to escape when using sed in a sh script?
– Kusalananda
Dec 5 at 11:49

add a comment |

up vote
1
down vote

favorite

This question already has an answer here:

What characters do I need to escape when using sed in a sh script?

3 answers

I use the following code to delete a line :

sed -i "0,/$DELETE_THIS/{/$DELETE_THIS/d;}" file.txt

But this code fails if the variable DELETE_THIS contains special characters, like ., /, * and so on...

Is there a way to tell sed to ignore all special characters and use them as basic text ?

edited Dec 5 at 12:02

Jeff Schaller

37.9k1053123

asked Dec 5 at 11:38

bob dylan

4821615

This question already has an answer here:

What characters do I need to escape when using sed in a sh script?

3 answers

I use the following code to delete a line :

sed -i "0,/$DELETE_THIS/{/$DELETE_THIS/d;}" file.txt

But this code fails if the variable DELETE_THIS contains special characters, like ., /, * and so on...

Is there a way to tell sed to ignore all special characters and use them as basic text ?

This question already has an answer here:

What characters do I need to escape when using sed in a sh script?

3 answers

sed regular-expression

edited Dec 5 at 12:02

Jeff Schaller

37.9k1053123

asked Dec 5 at 11:38

bob dylan

4821615

edited Dec 5 at 12:02

Jeff Schaller

37.9k1053123

asked Dec 5 at 11:38

bob dylan

4821615

edited Dec 5 at 12:02

Jeff Schaller

37.9k1053123

edited Dec 5 at 12:02

Jeff Schaller

37.9k1053123

edited Dec 5 at 12:02

Jeff Schaller

37.9k1053123

asked Dec 5 at 11:38

bob dylan

4821615

asked Dec 5 at 11:38

bob dylan

4821615

asked Dec 5 at 11:38

bob dylan

4821615

marked as duplicate by Jeff Schaller, don_crissti, thrig, roaima, Stephen Harris Dec 5 at 23:08

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

marked as duplicate by Jeff Schaller, don_crissti, thrig, roaima, Stephen Harris Dec 5 at 23:08

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

1

You would have to escape any special characters in your query expression. Related: What characters do I need to escape when using sed in a sh script?
– Kusalananda
Dec 5 at 11:49

add a comment |

1

You would have to escape any special characters in your query expression. Related: What characters do I need to escape when using sed in a sh script?
– Kusalananda
Dec 5 at 11:49

You would have to escape any special characters in your query expression. Related: What characters do I need to escape when using sed in a sh script?
– Kusalananda
Dec 5 at 11:49

add a comment |

1 Answer
1

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You have a string in $DELETE_THIS, which you want to pass to sed in such a way that sed will treat it literally.

For this, you must quote all characters which are meaningful to sed.

Put a backslash before them. For example, using Bash syntax:

DELETE_THIS="$(<<< "$DELETE_THIS" sed -e 's`[\/.*^$]`\&`g')"

This will convert, for example, ^ab[c-d]ef$ into ^ab[c-d]\ef$.

answered Dec 5 at 11:51

AlexP

7,0391024

add a comment |

1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

up vote
1
down vote

accepted

You have a string in $DELETE_THIS, which you want to pass to sed in such a way that sed will treat it literally.

For this, you must quote all characters which are meaningful to sed.

Put a backslash before them. For example, using Bash syntax:

DELETE_THIS="$(<<< "$DELETE_THIS" sed -e 's`[\/.*^$]`\&`g')"

This will convert, for example, ^ab[c-d]ef$ into ^ab[c-d]\ef$.

answered Dec 5 at 11:51

AlexP

7,0391024

add a comment |

up vote
1
down vote

accepted

You have a string in $DELETE_THIS, which you want to pass to sed in such a way that sed will treat it literally.

For this, you must quote all characters which are meaningful to sed.

Put a backslash before them. For example, using Bash syntax:

DELETE_THIS="$(<<< "$DELETE_THIS" sed -e 's`[\/.*^$]`\&`g')"

This will convert, for example, ^ab[c-d]ef$ into ^ab[c-d]\ef$.

answered Dec 5 at 11:51

AlexP

7,0391024

add a comment |

up vote
1
down vote

accepted

You have a string in $DELETE_THIS, which you want to pass to sed in such a way that sed will treat it literally.

For this, you must quote all characters which are meaningful to sed.

Put a backslash before them. For example, using Bash syntax:

DELETE_THIS="$(<<< "$DELETE_THIS" sed -e 's`[\/.*^$]`\&`g')"

This will convert, for example, ^ab[c-d]ef$ into ^ab[c-d]\ef$.

answered Dec 5 at 11:51

AlexP

7,0391024

You have a string in $DELETE_THIS, which you want to pass to sed in such a way that sed will treat it literally.

For this, you must quote all characters which are meaningful to sed.

Put a backslash before them. For example, using Bash syntax:

DELETE_THIS="$(<<< "$DELETE_THIS" sed -e 's`[\/.*^$]`\&`g')"

This will convert, for example, ^ab[c-d]ef$ into ^ab[c-d]\ef$.

answered Dec 5 at 11:51

AlexP

7,0391024

answered Dec 5 at 11:51

AlexP

7,0391024

answered Dec 5 at 11:51

AlexP

7,0391024

answered Dec 5 at 11:51

AlexP

7,0391024

add a comment |

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