How to write an arg into a file?
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I am trying to write some content to a file and at the same time change some values that will be passed through the args.
I followed this answer
Creating a file with some content in Shell scripting
cat > filename <<- "EOF"
File contents
More contents
EOF
So let say when I run the script like this:
./script Abraham
and I want to write inside the file something like:
Hello Abraham
More contents, etc...
I came from a Javascript background so I was trying something like:
`Hello ${1}, etc...`
but what I was getting inside the file was:
Hello $1
More contents, etc...
because is not letting me set the variable of the argument. So how can I accomplish that? Thanks in advance.
command-line bash
asked Feb 19 at 7:30
Carlos AbrahamCarlos Abraham
1113
add a comment |
I am trying to write some content to a file and at the same time change some values that will be passed through the args.
I followed this answer
Creating a file with some content in Shell scripting
cat > filename <<- "EOF"
File contents
More contents
EOF
So let say when I run the script like this:
./script Abraham
and I want to write inside the file something like:
Hello Abraham
More contents, etc...
I came from a Javascript background so I was trying something like:
`Hello ${1}, etc...`
but what I was getting inside the file was:
Hello $1
More contents, etc...
because is not letting me set the variable of the argument. So how can I accomplish that? Thanks in advance.
command-line bash
asked Feb 19 at 7:30
Carlos AbrahamCarlos Abraham
1113
add a comment |
I am trying to write some content to a file and at the same time change some values that will be passed through the args.
I followed this answer
Creating a file with some content in Shell scripting
cat > filename <<- "EOF"
File contents
More contents
EOF
So let say when I run the script like this:
./script Abraham
and I want to write inside the file something like:
Hello Abraham
More contents, etc...
I came from a Javascript background so I was trying something like:
`Hello ${1}, etc...`
but what I was getting inside the file was:
Hello $1
More contents, etc...
because is not letting me set the variable of the argument. So how can I accomplish that? Thanks in advance.
command-line bash
asked Feb 19 at 7:30
Carlos AbrahamCarlos Abraham
1113
I am trying to write some content to a file and at the same time change some values that will be passed through the args.
I followed this answer
Creating a file with some content in Shell scripting
cat > filename <<- "EOF"
File contents
More contents
EOF
So let say when I run the script like this:
./script Abraham
and I want to write inside the file something like:
Hello Abraham
More contents, etc...
I came from a Javascript background so I was trying something like:
`Hello ${1}, etc...`
but what I was getting inside the file was:
Hello $1
More contents, etc...
because is not letting me set the variable of the argument. So how can I accomplish that? Thanks in advance.
command-line bash
command-line bash
asked Feb 19 at 7:30
Carlos AbrahamCarlos Abraham
1113
asked Feb 19 at 7:30
Carlos AbrahamCarlos Abraham
1113
asked Feb 19 at 7:30
Carlos AbrahamCarlos Abraham
1113
asked Feb 19 at 7:30
Carlos AbrahamCarlos Abraham
1113
asked Feb 19 at 7:30
Carlos AbrahamCarlos Abraham
1113
1113
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
The quotes around the initial "EOF" prevent variable expansion. To use variables in the heredoc text, you need to an unquoted delimiter:
cat > filename <<- EOF
Hello $1
More contents, etc...
EOF
But then you'll have to be careful about shell syntax in the rest of the contents.
Another option is to write this line separately, and write the fixed contents using a heredoc:
echo "Hello $1" > filename
cat >> filename <<- "EOF"
More contents, etc...
EOF
Note the use of >> for appending after the initial write.
answered Feb 19 at 7:36
OlorinOlorin
1
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
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active
oldest
votes
The quotes around the initial "EOF" prevent variable expansion. To use variables in the heredoc text, you need to an unquoted delimiter:
cat > filename <<- EOF
Hello $1
More contents, etc...
EOF
But then you'll have to be careful about shell syntax in the rest of the contents.
Another option is to write this line separately, and write the fixed contents using a heredoc:
echo "Hello $1" > filename
cat >> filename <<- "EOF"
More contents, etc...
EOF
Note the use of >> for appending after the initial write.
answered Feb 19 at 7:36
OlorinOlorin
1
add a comment |
The quotes around the initial "EOF" prevent variable expansion. To use variables in the heredoc text, you need to an unquoted delimiter:
cat > filename <<- EOF
Hello $1
More contents, etc...
EOF
But then you'll have to be careful about shell syntax in the rest of the contents.
Another option is to write this line separately, and write the fixed contents using a heredoc:
echo "Hello $1" > filename
cat >> filename <<- "EOF"
More contents, etc...
EOF
Note the use of >> for appending after the initial write.
answered Feb 19 at 7:36
OlorinOlorin
1
add a comment |
The quotes around the initial "EOF" prevent variable expansion. To use variables in the heredoc text, you need to an unquoted delimiter:
cat > filename <<- EOF
Hello $1
More contents, etc...
EOF
But then you'll have to be careful about shell syntax in the rest of the contents.
Another option is to write this line separately, and write the fixed contents using a heredoc:
echo "Hello $1" > filename
cat >> filename <<- "EOF"
More contents, etc...
EOF
Note the use of >> for appending after the initial write.
answered Feb 19 at 7:36
OlorinOlorin
1
The quotes around the initial "EOF" prevent variable expansion. To use variables in the heredoc text, you need to an unquoted delimiter:
cat > filename <<- EOF
Hello $1
More contents, etc...
EOF
But then you'll have to be careful about shell syntax in the rest of the contents.
Another option is to write this line separately, and write the fixed contents using a heredoc:
echo "Hello $1" > filename
cat >> filename <<- "EOF"
More contents, etc...
EOF
Note the use of >> for appending after the initial write.
answered Feb 19 at 7:36
OlorinOlorin
1
answered Feb 19 at 7:36
OlorinOlorin
1
answered Feb 19 at 7:36
OlorinOlorin
1
answered Feb 19 at 7:36
OlorinOlorin
1
1
add a comment |
add a comment |
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