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UNIX for Beginners Questions & Answers
Escape bash-special character in a bash string
Post 303031844 by Corona688 on Wednesday 6th of March 2019 12:25:47 PM
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1. Shell Programming and Scripting
Hello
would appreciate if somebody can post a bash script that checks if the first character of the given string is equal to, say, "a"
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I am using this character as a delimiter 'þ'
Currently, I set it straight:
DELIMITER='þ'
However, while copying the file, this character often gets mangled. Is there a bash way (perhaps using tr or printf) of generating this character.
It corresponds to
"chr(0xfe)" if using perl. (I've... (6 Replies)
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Hi!
If I want to extract a character from a specific position of a string, I can use ${string:1:1} (if I want character at the position 1). How can I do the same thing, when the number of position is contained in the variable? ${string:$var:1}doesn't work, unfortunately.
Thanks in advance. (2 Replies)
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4. Shell Programming and Scripting
In bash, how can one remove the last character of a string? In perl, the chop function would remove the last character. However, I do not know how to do the same job in bash.
Many thanks in advance. (12 Replies)
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5. Shell Programming and Scripting
I am having issues escaping special characters in my AWK script as follows:
for id in `cat file`
do
grep $id in file2 | awk '\
BEGIN {var=""} \
{ if ( /stringwith+'|'+'50'chars/ ) {
echo "do this"
} else if ( /anotherString/ ) {
echo "do that"
} else {
... (4 Replies)
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6. Shell Programming and Scripting
Hi,
How to use * in call to pl/sql block from shell script?
The line "select * from" is causing all files and directiores to show up in email notification but if I give all column names then it works,
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7. UNIX for Advanced & Expert Users
My input is:
jdbc:Oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=10.147.109.211)(PORT=1526))(CONNECT_DAT A=(SID= MWDBD22)))
In the search pattern, ( and ) and . and @ are special RE, and need to be escaped \( and \) and \. and \@
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8. Shell Programming and Scripting
Hello,
I want to check whether string has only numeric characters. The following code doesn't work for me
#!/usr/local/bin/bash
if ]]; then
echo "true"
else
echo "False"
fi
# ./yyy '346'
False
# ./yyy 'aaa'
False
I'm searching for solution using character classes, not regex.... (5 Replies)
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9. Shell Programming and Scripting
I am writing a bash script that will find all references to the “Well_List” in the “Comp_File”.
I am filtering a Well_List that contains the following:
TEST_WELL_01
TEST_WELL_02
TEST_WELL_11
TEST_WELL_22
GOV_WELL_1
GOV_WELL_201
PUB_WELL_57
PUB_WELL_82
.
.
Comparison... (5 Replies)
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10. Shell Programming and Scripting
I am still learning shell scripting. Recently I see a function for read configuration. But some of special character make me confused. I checked online to find answer. It was not successful. I post the code here to consult with expert or guru to get better understanding on these special characters... (3 Replies)
Discussion started by: duke0001
3 Replies
LEARN ABOUT DEBIAN
urlencode
URLENCODE(1) GridSite Manual URLENCODE(1) NAME
urlencode - convert strings to or from URL-encoded form SYNOPSIS
urlencode [-m|-d] string [string ...] DESCRIPTION
urlencode encodes strings according to RFC 1738. That is, characters A-Z a-z 0-9 . _ and - are passed through unmodified, but all other characters are represented as %HH, where HH is their two-digit upper-case hexadecimal ASCII representation. For example, the URL http://www.gridpp.ac.uk/ becomes http%3A%2F%2Fwww.gridpp.ac.uk%2F urlencode converts each character in all the strings given on the command line. If multiple strings are given, they are concatenated with separating spaces before conversion. OPTIONS
-m Instead of full conversion, do GridSite "mild URL encoding" in which A-Z a-z 0-9 . = - _ @ and / are passed through unmodified. This results in slightly more human-readable strings but the application must be prepared to create or simulate the directories implied by any slashes. -d Do URL-decoding rather than encoding, according to RFC 1738. %HH and %hh strings are converted and other characters are passed through unmodified, with the exception that + is converted to space. EXIT CODES
0 is always returned. AUTHOR
Andrew McNab <Andrew.McNab@manchester.ac.uk> urlencode is part of GridSite: http://www.gridsite.org/ urlencode November 2003 URLENCODE(1)