Questions tagged [pattern-matching]
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172 questions
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Sed delete everything after a word
I'm new to sed, I have a string
lightdm --session-child 14 21
the two numbers can change and I would remove everything
after lightdm
I tried various way but none worked
sed 's/ --session-child*//'
...
- 33
2
votes
1
answer
104
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Make parameter substitution in newline-separated string more efficient
The following code should demonstrate and help with testing inefficient Pattern Matching expressions in a Parameter Substitution for a newline-separated strings var vs. array.
The goal is to achieve ...
- 59
0
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4
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112
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How to replace pattern in last line
I'm trying to replace "}," by "}" from the last line of a file :
My /etc/firefox/policies/policies.json file like this because I added the certificate lines using a for loop :
$ ...
- 2,401
3
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1
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290
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To understand zmv ## patterns
This is zmv command to non-recursively replace any number of spaces with a single underscore (thanks to Stéphane Chazelas, who helped me with it):
zmv -- '* *' '${f// ##/_}'
And here is a command ...
- 1,347
2
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1
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301
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How is the correct syntax for a more complex case statement?
case "$1","$name" in
-py | --python | --python3,*) if [[ "$name" =~ \..+$ ]]; then
That doesn't catch stuff, which actually it should,
like…
USERNAME@HOSTNAME:~$ ...
- 193
-1
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5
answers
77
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multiline grep search into separate files per occurence
I have a file as following:
example.txt
-1
15
1 0 0 11 -1.0000E+001 1.0000E+001 -1.0000E+001
2 0 0 11 1.0000E+001 1.0000E+001 ...
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0
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1
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54
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Retrieve the Following Occurrence of the String 'PWD' Once the Given String is Located
Below is my sample test.log file
export SQRDIR=/v/orahome/Middleware/Oracle/bin64
export OID=ap0092
export PWD=pass1
export FDPWD=pass1
export AP0085_PWD=pass1
export SVR=AFFPROD
export ...
- 517
1
vote
3
answers
363
views
awk print between lines when "/" is part of the name
I need to print lines between those that contain a "/" in the name.
I tried with:
awk '/+SOLUTION/ESTIMATES/,/-SOLUTION/ESTIMATES/' $F > fil$F
and
awk '/+SOLUTION"/"ESTIMATES/,/...
- 23
0
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4
answers
84
views
Wrap specific string with characters
For example, in a large file I might have:
This is a /16 text file
I'd like to change it to the following:
This is a [[[/16]]]] text file
Would like to match the exact string /16
Is there a way to ...
- 707
2
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0
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76
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Pattern list in bash extglob containing a / and a |
Here is a transcript of commands (and their output) that explains my problem:
/tmp/example $ shopt -s
cdspell on
checkwinsize on
cmdhist on
complete_fullquote on
direxpand ...
1
vote
2
answers
52
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replace both filename and filename's content relying solely on pattern found on the name-of-the-file
I'd like to know if it's possible to replace both filename.ext and a matched pattern inside its content regarding a pattern founded on the filename itself using sed (and grep also, maybe?).
Let me ...
- 33
1
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1
answer
3k
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Searching for a pattern in a binary file using python script
I want to find repeated copies of the config section within the partition dump (binary file), using pattern and 'magic' header. The config section always starts with 202 '0xff' bytes followed by 4 ...
- 553
0
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1
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118
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Bash: Difference between "Pattern Matching" and "Filename Expansion" in the context of parameter expansions that do matching
Edit: Question ansewered by Gordon Davisson's comment
I was reading the GNU Bash manual, and I noticed that there are basically three types of "Parameter expansion" that do pattern matching:
...
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3
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3
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1k
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Find files matching one pattern, but not another, using grep, awk or sed [duplicate]
I need to locate .php and .pl files that do not contain one string (e.g. aaa), but do contain another (e.g. bbb).
I'm currently using this command:
find /path/ \( -iname '*.php*' -or -name '*.pl*' \) -...
- 2,792
4
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4
answers
728
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grep multiple patterns with differing number of matching groups?
I'm trying to tally insertions and deletions from git diffs.
I have the following, which when piped one or more strings of the form "4 files changed, 629607 insertions(+), 123 deletions(-)" ...
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