Linux Ask! is a Q & A web site specific for Linux related questions. Questions are collected, answered and audited by experienced Linux users.
Move forward or backward by a word in bash shell
Answer:
To move more efficiently in bash shell, you can use the following short cuts
Meta + f (move forward by a word)
Meta + b (move backward by a word)The Meta key is the Alt key under most systems, on Mac, you would need to enable "use option as meta key" in the Terminal's Preference.
How to echo single quote in bash shell
Answer:
To echo single quote (using single quote only), you can try
# echo foo
foo
# echo \'''foo
'foo
How to ignore error in Bash script
Answer:
We have learned in the past on how to show the exit status of a given command.
But is it possible ignore the error and return normal exit code even the command has failed?
Yes, pipe "|| true" to the end of command, e.g.
# foo || true
-bash: foo: command not found
# echo $?
0As you can see even the command foo was not found, our last exit code is still zero.
Split on specific characters on Bash Script's for loop
Answer:
If you want to Bash script's for loop to split on non white-space characters, you can change the IFS, e.g.
#!/bin/bash
IFS='-'
list="a-b-c-d-e"
for c in $list; do
echo $c
doneThe above script will split on the character '-'
E.g.
# ./test.sh
a
b
c
d
e
Check if a file exist in Bash Shell
Answer:
The following script demonstrates how to check if a file exist, using shell (Bash) script
#!/bin/bash
if [ -e test.txt ]
then
echo 'The file exists.'
else
echo 'The file does not exist.'
fi
